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Pentax KX

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100% of reviewers $128.26 9.68
Pentax KX

Pentax KX
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Pentax KX
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Pentax KX
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Description:
The Pentax KX was one of the three original K-mount cameras introduced by Pentax as a replacement for the Spotmatic family of screw mount cameras.

The KX model was one step up from the KM with a more sensitive light meter, a wider ISO range, and mirror lock-up. It had a match-needle exposure readout so that the shutter speed set was indicated in the viewfinder. The aperture set on the lens was visible in the viewfinder through a small window.

The KX is the only Pentax where the wind lever must be pulled slightly out for the meter to work. This makes the camera unsuitable for left-eyed users. Fortunately Pentax didn't repeat this poor design on their later cameras.

KX
Year introduced
1975
Mount
K
Meter range
1 - 18 EV
Meter pattern
Centerweight
ISO range
8 - 6400
DX ISO range
No DX coding
Exposure modes
M, B
Exposure compensation
Not applicable
Exposure memory lock
Not applicable
Shutter speeds (auto)
Not applicable
Shutter speeds (manual)
1 - 1/1000s, B
Shutter speeds (mechanical)
1 - 1/1000s, B
Self timer
Yes
Mirror lock-up
Yes
Auto bracketing
Not applicable
Multiple exposures
Yes
Winder
No
Built-in flash
No
TTL flash
No
P-TTL flash
No
Sync speed
1/60s
Flash exposure comp
Not applicable
Autofocus
No
Autofocus sensitivity
Not applicable
Power zoom
No
Viewfinder
0.88x, 93%
Viewfinder type
Pentaprism
Diopter correction
No
Exchangeable screen
No
Depth of field preview
Yes
Image size
24 x 36 mm
Panorama format
No
Battery
2 x S76
Battery grip/pack
No
Size (W x H x D)
143 x 91.5 x 52.5 mm
Weight
631 g
Price History:



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Senior Member

Registered: July, 2008
Location: South Carolina, USA
Posts: 273

1 user found this helpful
Review Date: June 5, 2009 Recommended | Price: None indicated | Rating: N/A 

 
Pros:
Cons:

I am a relative newcomer to the world of photography, having started in the summer of 2006, borrowing my father's K1000 (what else?)

Not long after I started wanting something more, and soon settled on the KX, and purchased one not long after.

Long story short, the KX has become my favorite, even after an ME super and an AE-1 were added to the family.

The KX has everything. It's weighty, but it's the weight of quality. The fit and finish on this camera is amazing; it's built more solidly than any other SLR I've held, and its smoothness and precision and operation are second only to the SV I used for a period (the Sightseeing Screwmount on the film forum--thanks woof!) It's big, but that means there's enough room for people like me who have big hands to have a good, solid grip on the camera. You'll definitely want a strap for it if you carry it for any extended period, however.

The viewfinder is excellent. It's not the biggest or the brightest on a Pentax SLR, but a viewfinder does not have to be big or bright to be good. It's a full-information viewfinder. A large translucent blue needle points to the currently selected shutter speed on a scale on the right-hand side of the viewfinder, and a smaller needle moves with the amount of light and the aperture setting. Match the two and you've got a good exposure. It's an intuitive system that works well everywhere except dim light. A window above the viewfinder allows for direct optical viewing of the aperture setting by a periscope-like system (you can see the window on the prism just above the lens mount in the pictures above.) These are apparently easily knocked out of alignment, and mine was when I first got the camera (a CLA by Eric fixed that, and many other problems--the camera was like new when I got it back. He does wonderful work.) When it was available new it came with a choice of focusing screen: microprism or split image with microprism collar. The screens are the same as the K1000 screens, but can only be changed by a technician.

The meter is very accurate, and the available film speeds are 8-6400. The meter is activated by pulling the fild advance lever out to the pre-advance position and half-pressing the shutter button. You'll hear and feel the button click. The meter will stay on until you push the advance lever fully inwards against the body.There is a memo holder on the back of the film chamber, which I've always found to be a useful feature. It's also got a DOF preview button, mirror lock-up, a self-timer, and a real battery check button. Speaking of batteries, it takes 2 SR44/LR44/357 cells.

The only real issue I have with the camera is that the shutter's loud, but it's a mechanical camera and that happens. I don't really shoot in areas where I have to be unobtrusive, so it's not that much of an issue. Also, before the camera was CLA'd, I took it on a field trip with my photography class to Eastern State Penitentiary in Philadelphia (really neat place, it's an abandoned prison now run as a park-like place). It was below freezing that day, and the KX literally started to freeze and lock up. But it might not have those issues now that it's CLA'd. YMMV.

I think the KX is the king of all the Pentax mechanical bodies. People keep talking about the MX, and I'm sure it's a great body--it's a Pentax mechanical camera after all. But I think the KX comes out on top. Give it a try, and I think you'll fall for it too.
   
Senior Member

Registered: October, 2008
Location: Great Plain, Hungary
Posts: 204
Review Date: July 1, 2009 Recommended | Price: None indicated | Rating: N/A 

 
Pros:
Cons:

My first k-mount Pentax body was an MX. I liked it so much that during the years I had five of them, now only three remained. And then a couple of weeks ago I was lucky to purchase a black KX with a 1.4/50mm lens in pretty good condition. And it became my 2nd favourite all mechanical Pentax body... or the Nr 1? Well... time will decide on it.

Anyway. The KX is a very sophisticated, durable, simple to operate camera with all the features you need to take and make photos. There might be demands towards Pentax to have their product line developed with more commitment but who cares when most of their cameras have a pesonality you cannot find at other manufacturers. Because a character is built up of strenghts and weaknesses. And Pentax seems to follow this philosophy: they make cameras with personality and leave it that way. Developing things to a perfect level makes them boring. This is why we love Pentax, this is why I love the KX among other Pentax cameras. It has its strenghts and weaknesses but the balance beetween these two are so good that you feel like Pentax is the ordinary, fallible man amongst the saints.
   
Pentaxian

Registered: August, 2009
Location: Wandering the Streets
Posts: 1,411

1 user found this helpful
Review Date: October 10, 2009 Recommended | Price: None indicated | Rating: N/A 

 
Pros:
Cons:

I was lucky enough to find my Pentax KX, complete with a Pentax 50mm f/1.2 lens, in a pawn shop in Reno, Nevada, back in 1979. It was used, but just barely, and over the years it has sealed the deal for me on Pentax. I can't imagine myself without a Pentax camera. Since then I've added three more Pentax cameras to my slowly growing collection, but I still use this one because it is so easy to work with. In fact, if it wasn't for trying to keep up with children, and now grandchildren, with a manual focus lens (it is possible to do but it takes serious concentration), I may never have bought an autofocus camera at all. Well...I probably would have anyway

This Pentax KX, with it's 50mm lens, has been the perfect companion. The viewfinder is sharp enough that I can still use it, even though my eyes are no longer nearly as good as they were when I bought it. The meter reading is simple to use and tells you in a minute whether your exposure is good or not. With this camera I can change shutter speed and aperture and see exactly what they are in the viewfinder. When shooting wildlife or kids (very close to the same in terms of having to keep a close eye on them when you are trying to take a picture), being able to track them in the viewfinder while you're adjusting exposure is a great advantage. In fact, I was seriously disappointed when I found out my first autofocus camera didn't have that little window to show me the aperture setting. Even though this camera uses batteries, it is possible to take pictures without any batteries in it. I know because I've done it. The light meter won't work but you would be surprised to know how many pictures turn out just fine by using only the Sunny F16 rule. They probably won't get accepted by Arizona Highways or similar magazines but most of us won't be getting any pictures in those magazines anyway, even though we are using $1,000 plus digital cameras with $1,000 lenses.

I have recently gotten more serious about my photography and I should note that, until a few months ago, I had never used the mirror lockup or the depth of field on the KX. (I probably should have read the manual but that wasn't something I was known for doing back then, or even now for that matter.) I probably have thousands of pictures of kids, pets, birthday parties, hunting and vacation trips that were all taken handheld with this camera using nothing but Kodak ISO 400 and 800 film, and most of those pictures turned out great. I admit, a lot of the kid shots came back a little blurry but that wasn't the fault of the camera and a tripod would not have made any difference. I actually didn't even know the camera could lockup the mirror or tell you the depth of field, and I know I didn't know what those features were used for. I actually had to go find the user's manual (I am so glad my wife knows where everything is) when I read my first photography book about a year ago and learned what those controls could do for me. Here it is, 30 years later, and this camera is still advanced enough that it does everything I really need to take great pictures, some of which might get into a magazine someday.

Don't get me wrong, I absolutely love my new digital Pentax, especially being able to see the picture as soon as I take it, but I still love looking at the results I get from this camera. I only hope that my digital is as tough as this KX, but I'm afraid it probably isn't. This KX has been used in the back country of Nevada since I brought it home from the pawnshop in 1979, on backpacking trips and 4-wheeling, and it has never required any professional service in all that time. In fact, I've learned the hard way, that if I am headed for the hills, I am far better off carrying this camera then bringing my digital. Shortly after buying my K200D I took a bike trip into the back country. Naturally, I left the "old" KX home and took my digital with me instead. Imagine my surprise when I returned home and found that several of my digital pictures had visible dust spots. I repeated this same exercise twice more (I'm a slow learner) and I learned that I can get dust bunnies on that digital sensor in nothing flat, even though I carry it in a ziplock bag. In three months I've had to have it cleaned twice. But the KX just shrugs off the dust and keeps on putting out great pictures. I do keep it in a ziploc bag now, but that is a fairly recent practice I adopted with my autofocus camera (it wasn't quite as resistant to dust as the KX seems to be although it is lots better then the digital). A good dusting outside with some canned air (formerly a camel hair brush), and a little careful cleaning with a Q-Tip inside, has been all the maintenance this camera has ever needed. I have recently found a pretty good camera repair service in Reno (when I needed to get my digital sensor cleaned) and I'll be taking this KX in for it's first professional cleaning.

I am not by any stretch of the imagination an expert on cameras, and I'm barely a semi-competent amateur photographer, so take this for what it's worth. This is a great camera! If, for some reason, I found out tomorrow that I could only keep one camera, and all the rest had to go, this is the one I would keep.

I scanned in one of the recent pictures I have taken with this camera to give you a sample of what it is still capable of. This was taken with my KX and my Rokinon 85mm f/1.4 lens (another fairly recent purchase.) Please forgive the scanner (it is my first try at this) and the photographer.
   
Pentaxian

Registered: December, 2007
Location: In the most populated state... state of denial
Posts: 1,852
Review Date: October 17, 2009 Recommended | Price: $50.00 | Rating: 10 

 
Pros: Balance, light meter
Cons: Weight

Very nice camera, has the same ergonomics and feel of the Spotmatic and a very nice featured package

Lightmeter is very good (and can be turned off), viewfinder is very bright
I love the information provided in the viewfinder a-la Nikon FE.
Aperture of the lens (via window-mirror)
Current speed (green-blue bar) and light meter in needle style
The lightmeter can be turned off as compared to the budget K1000

The fressnel type focusing aid could use a split screen, I do not know if that can be replaced easily but with some practice it works fine.
   
Inactive Account

Registered: October, 2009
Posts: 1
Review Date: October 25, 2009 Recommended | Price: None indicated | Rating: N/A 

 
Pros:
Cons:

I bought mine in 1976 and used it constantly till I bought a MZ-50.

The KX was a workhorse and did not breakdown.
   
Otis Memorial Pentaxian

Registered: March, 2007
Location: Vancouver (USA)
Posts: 42,007

1 user found this helpful
Review Date: January 30, 2010 Recommended | Price: None indicated | Rating: 10 

 
Pros: build, handling, full information viewfinder, other features
Cons: fragile film speed dial

I have to start this review by stating that I am truly fond of my Pentax KX and shopped for a long time before I finally bit the bullet to purchase. As a full-featured, all-mechanical film SLR, it is a great camera and one of the best Pentax products of the last 40 years.

Notable Features:
Many of these may not seem remarkable, but the full package was unusual at the time.
  • Wide ASA/ISO range (8-6400)
  • Center-weighted SPD meter
  • Full information (optical) viewfinder showing both shutter speed and aperture
  • Self-timer
  • Mirror lock-up (MLU)
  • Depth-of-field (DOF) preview
  • Hot shoe

Build:
My overall impression is that the KX is very rugged. This is not surprising given its all-metal construction and shared elements from the M42 screw mount bodies that preceded it. It does have at least one short-coming...the ASA/ISO setting dial. The lock tab and dial are fragile and easily damaged. The horizontal run cloth shutter is somewhat noisier (in my opinion) than previous models and other cameras I own, but it is based on established design and easily serviced/adjusted if need be.

To expand on the noisy shutter matter, I took delivery of my KX not long after spending two weeks with a Pentax SV. The difference in build precision, feel, and "silkiness" is night and day between the two. I thought things would improve after a CLA by Eric, but such was not the case. The KX is simply "rougher" in execution than its older brother. Not clunky like a Zenit, just not smooth like the SV. Disappointing, but true.

In Use:
It is not unusual to read comments regarding the KX being "large" or "bulky". As compared to the later "M" body cameras, the KX is larger, but it is hardly a hulk. Its dimensions are virtually identical to earlier Spotmatic bodies and on the small side for SLR cameras of the time. The KX's weight is appropriate to its size for an all-metal body. I find that the camera is well-balanced and handles nicely. Controls are well-placed and operate dependably. Overall, the camera has a quality and precision feel.

I should note that the KX is particularly easy to use with earlier M42 lenses using stop-down metering. Once activated by partial press of the shutter release, the meter stays on until turned off by returning the wind lever from its "ready" position. This makes it very easy to adjust the shutter and aperture as needed without having to futz with keeping the shutter release "just so" as with certain other cameras using similar match-needle metering. Come to think of it, I guess that feature is nice with K-mount lenses as well.

In regards to the left-eyed user vs. wind lever standout to meter issue noted in the general description...I frequently shoot left-eyed and can't say that I have ever had a problem. I suppose if the user has a very flat nose there is some chance of bumping the lever with cheek or eyeball. In defense of Pentax, this approach was common in cameras of the day. I have three bodies from three makers that work that way.

As for its other features, even though I seldom use one, it is nice to have a self-timer. Ditto for the MLU. We take expanded ISO for granted, but after spending sometime with cameras that max out at 800, it is nice to have the option of going higher with the KX. I should also mention the SPD (silicon photo diode) metering. It was a top-shelf feature at the time (shared with the K2) and delivers excellent sensitivity and very quick response.

Viewfinder:
It might seem strange to call this one element out for special emphasis, but the KX viewfinder is worth extra attention. Allowing the user to view both shutter speed and set aperture from the viewfinder was somewhat unusual for the day. While the viewfinder is not as bright nor does it have as good a coverage (only 93%) as those on later models, I have found my KX stands out in terms of showing a realistic DOF and focus accuracy. My camera has a microprism focus aid as opposed to a split-image (they came both ways). Sometimes I wish it had both, but they did not come that way. Too bad the screens are not interchangeable.

The match-needle (follow-needle) meter display is a pleasure to use. You can instantly see your current shutter speed/aperture settings and how many stops over/under you are from the recommended setting. Exposure compensation is a breeze with no surprises. I cannot overemphasis the superiority of this approach (shared with the K2 and with various Nikon and Ricoh models) to center needle and over/under electronic displays.

Other:
The KX shares most accessories with the K1000 and other K-series bodies. It also has a degree of compatibility with earlier Spotmatic models as well. My camera, for example, fits nicely into a much older ever-ready case made for a spottie.

Summary:
It is tempting to draw comparisons between the KX and its competition from back in the day. I will resist and let the camera rest on its own laurels. It is a competent tool and pleasant to use...a great camera in almost every way. For a fully-mechanical K-mount body, I don't believe that you can do better short of the LX, regardless of brand. This is particularly true when matched with the excellent K-series Pentax lenses sold at the time it was made. While current pricing (2010) places the KX a little higher than many film cameras, it is still less expensive than comparable MX and even many K1000 bodies.

Pluses
  • Great full-information viewfinder
  • SPD meter
  • Uses readily available silver or alkaline batteries
  • Rugged
  • MLU
  • DOF preview
  • All mechanical, not battery dependent
  • Easily serviced when needed
  • Handling, particularly with larger hands

Minuses
  • Flash synch at 1/60s max
  • Noisy shutter
  • Fragile ASA/ISO dial
  • Brighter viewfinder screen would be nice

Steve
   
Pentaxian

Registered: February, 2010
Location: Eerbeek
Posts: 1,857

1 user found this helpful
Review Date: February 9, 2010 Recommended | Price: $80.00 | Rating: 10 

 
Pros: Great viewfinder, aperture window, non-distractive finder, independence of batteries
Cons: only if you use your left eye to focus (I don't)

After a brief use of an ME, I bought a black KX in 1980s and frankly, the mere possession of the KX (with 2.8/35, 2.0/85 and 4.0/200 Pentax-M lenses) kept me from going digital. This camera is so rock solid, has indeed such a good design (the viewfinder info is spot on and not distractive, as I found the ME and MX ones), that I could never see myself part from it. I only ever coveted the LX after the KX, but not as a replacement—as an extra.

But this week I ordered a 645, as well as 2.8/55, 2.8/75 and 3.5/150, all of which are on their way. So I'm no longer that certain I'll do much with the KX (while I lost the ME which I rarely used). I may put them on sale, but still, even if I don't use the KX (and the 35/85 combo) it's hard to let go.

I liked the mirror lock-up possibility, which has come in handy (the mirror is indeed a bit noisy, although does give you that feeling of confidence that it isn't going to break down, ever). Well it never did so far.

EDIT:
I sold my KX in 2010 or 2011. Occasionally regretted the decision, although I received more for it than when I bought it.
EDIT 2:
I repurchased a black KX in great condition (new old stock) in 2018. Together with the 3.5/24-35mm zoom, the 2/85mm and various normal lenses it is a great set.
I purchased a second KX to be able to vary film.
   
Veteran Member

Registered: April, 2007
Location: Uppsala, Sweden
Posts: 576
Review Date: May 7, 2010 Recommended | Price: None indicated | Rating: N/A 

 
Pros: Rigid, user friendly, ISO range, Fully mechanical, Timer and MLU at once.
Cons: Viewfinder could be brighter, shuttertimes, film lever has to be half cocked to use exposure meter.

Pros Rigid, user friendly, ISO range, Fully mechanical, Timer and MLU at once.
Cons Viewfinder could be brighter, shuttertimes, film lever has to be half cocked to use exposure meter.
Rating 9
Price 90€ with 55/1.8
Years Owned 3

I can recommend this camera
: Yes

Value, Features, Performance & Size
One of the most value for money Pentax bodies in my opinion.

Camera Review
This camera has been my workhorse since I got it, and it has served me well. The only known fault my KX has is that the blue shutter indicator in the viewfinder stops working below around -18°C. Otherwise it has not had a single error since I got it.

What I like about it:
- Fully mechanical, never have to worry about batteries
- Feels solid and heavy, I see weight as a positive aspect as it makes it more stable
- Every dial and button is exactly where you would expect it to be, very easy handling
- ISO range from 8-6400 means no problem with having right ISO even when pushing a lot (or pulling for example efke 25, if you want to do that...)
- You can use self timer and mirror lock up at the same time (which is logical, but not the case with the LX for example), I use this a lot for low light from 1/15 -1sec
- Full information viewfinder with a match needle exposure meter, LOVE IT!, you instantly see what time you need (as opposed to the for example the MX where you only have over or under exposure indication.)

What could be better?:
- The viewfinder is not up with the MX and LX viewfinders when it comes to brightness and size, still not bad but it could be better
- Shuttertimes could well be extended to 4-1/2000 as the LX has
- The "half cocked film lever when using exposure meter" is a bit unnecessary, I could do well without it

Not really cons but this is what drags it down from the 10, this camera has no real cons in my opinion.

The dim viewfinder can be helped by using fast glass, and when doing to this camera really shines! Focus really clicks into the microprism, KX + 50/1.2 is a dream combination and I rarely miss focus even at 1.2. When using slower lenses (from f/3,5) on the other hand I would like to have a split screen also.
   
Site Supporter

Registered: October, 2008
Location: Vancouver, Canada
Posts: 8,091
Review Date: June 16, 2010 Recommended | Price: $243.33 | Rating: 10 

 
Pros: Ease of use, build and durability.
Cons: None this camera has all the features you need and is built to last decades.

Pros Ease of use, build and durability.
Cons None this camera has all the features you need and is built to last decades.
Rating 10
Price Black - $325.00, Silver - $320.00 (1975 list price), Silver Split Screen - $85.00
Years Owned Since 1975

I can recommend this camera: Yes

Value, Features, Performance & Size
The KX was released in 1975 as part of the new “K” series line of film cameras & lenses, featuring the new bayonet mount. The KX was second inline to the K2.

The “K” series in my opinion is the height of Pentax’s quality, durability and ease of use. The KX is well built, large enough for my big hands and has all the features you need:

- TTL metering
- Mirror lockup
- DOF preview
- Self Timer
- Aperture-reader window
- Flash hot shoe
- 1 to 1/1000 sec. shutter
- ASA range 8 to 6400
- Bayonet mount

Camera Review
I bought my first Pentax camera in late 1975 and picked a KX, along with a K55/1.8, K28/3.5 and a K135/3.5 for lenses. This KX has been in continuous for 35 years now and had no work done to it, until 2008. (It’s first CLA and the film take-up spool was replaced)

Not bad for a camera that has travelled around the world multiple times and taken pictures in all seven continents. The KX has also worked perfectly in all environments; the cold of Antarctica, the heat of North Africa, the humidity of Australia’s “Top End” and the dampness of Vancouver, Canada.

The KX is perfection in a fully manual film camera.


July 31 2016 Update
I took my 40+ year old KX out for its yearly shoot today and it was just like getting together with an old friend! Popped in some fresh batteries, loaded the film and turned on the meter, everything worked like it was brand new.

I have purchased many other Pentax film bodies over the past 10 years (Spotmatic, K1000/SE, KM, K2, K2DMD, ME, MX, LX, Super A/Super Program, P50, 6x7, 67 & 67II), but using the KX again makes me feel "happy", everything is just right with this body compared to my other cameras. The KX is by no means the "best" camera that I own, but it's still my favourite camera. All my other film bodies seem to have issues, lack of features or designs that somewhat annoy me. There is nothing I would change on the KX after these 40+ years of use that would make me like it more, it's still number one in my books.
   
Veteran Member

Registered: October, 2006
Location: NJ USA
Posts: 13,072

3 users found this helpful
Review Date: July 23, 2010 Recommended | Price: $120.00 | Rating: 10 

 
Pros: A K mount pinnacle
Cons: none

Pros A K mount pinnacle
Cons none
Rating 9
Price 100
Years Owned 6

I can recommend this camera: Yes

Value, Features, Performance & Size
Superb basic camera with some magic
One of the better Pentax viewfinders
Spotmatic like size and heft

Camera Review
The reviews above cover this camera rather well, so I'll just add some of my own observations.

The viewfinder - excellent information, really a joy to use. While not the largest or brightest Pentax ever, the KX excells in focusing: the image pops into focus better than with any other Pentax I've used.

I like the manual metering, very accurate, and I get to pick what to measure.

Finally, there's something intangible with this camera that has resulted in a bigger 'hit' ratio in my photography than with other cameras. I suppose it's the balance of all features and controls, the beautiful view finder, and the size and heft overall. Or maybe it's the Pentax pixie dust


The incredible Pentax KX (1976) by Nesster, on Flickr
   
Junior Member

Registered: July, 2009
Location: Europe, Benelux, Zeeuwsch-Vlaanderen, Terneuzen
Posts: 26

1 user found this helpful
Review Date: September 27, 2010 Recommended | Price: $250.00 | Rating: 10 

 
Pros: All mechanical, pleasant matte screen
Cons: no connection for winder/motordrive (separate version, but rare) no interchangable screens

Pros All mechanical, pleasant matte screen
Cons no connection for winder/motordrive (separate version, but rare) no interchangable screens
Rating 10
Price (U.S. Dollars) ƒ 250 (dutch guilders)
Years Owned since 1994

I can recommend this camera: Yes

Value, Features, Performance & Size
For me the Pentax KX is the best camera I ever had. It is uncomplicated (yet full-featured), easily operated and runs very smooth.
1) Fast SPD (silicon photo diode) light-meter, contrary to the slow CdS meter of most contemprary competitors (including K1000 and KM).
2) Depth-of-field-preview, Mirror-Lock-Up (and Self-timer)
3) great matte focussing-screen and viewfinder with full exposure info (although not as bright as more recent camera's)
4) pleasant shutter-sound, although not as silent as many cloth-curtain-shutters. Just run it at 1/15 and you hear the same sound as that of the legendary Spotmatic-shutter.

Camera Review
For me the Pentax KX is the best camera I ever had. It is uncomplicated (yet full-featured), easily operated and runs very smooth.

This camera gives full controll to the user. I can fully confirm what Stevopedia wrote above here. I prefer it well above the MX and LX just because those miss the smoothness that the KX has. Despite MX has a motor-drive-connection and is more compact, I do not like it as much. The needle is more convenient as the led's and dials on the MX are way too difficult to adjust.

For me the best 35mm SLR's Pentax ever made are:
1) KX (this one from 1975, not the digital version of 2009)
2) LX not as smooth as the KX, but definately second and with so much extra I still regret not buying one in 1993 (instead of Z-1).
3) SV the most Elegant of all Pentaxes

Other competitors in the top 10: Super-A, K2(dmd), Z-1(p), SFXn, MZ-S.

In fact, I like KX and LX more than the Z-1. Nowadays I use a K200d but still like to incidentally use my S1a and would do so with the KX if I hadn't made it's shutter lock. (I would also still use the LX, but the one I bought has a back that opens when a film is inside)

background
I started photographing with my father's Voïgtlander Vitoret D (viewfinder) and Agfa Colorflex (reflex, inherited from my grand-dad) which both had an uncoupled selenium-lightmeter. I preferred the Agfa because I could accurately focus (using split-image) instead of setting the lens to an estimated distance only. For my first camera I settled for a secondhand Ricoh KR-10 super. That is how I entered the K-mount world.

In the following years I had a couple of lenses including a Vivitar 400mm f/5.6 which I used for birding, mostly using a shoulder-mount. As I wear glasses, it is not possible to advance the film with the camera at the eye, e.g. while following a the moving subject. Therefore I purchased a winder for the Ricoh. Despite that I constantly hit the limitations of that camera:
the lack of a depth-of-field preview, lack of AE-lock and high sensitivity to bright skies being the most important. In 1993 I bought a Pentax Z-1 which would addres all these issue's.

The KX seemed to me the perfect addendum to the Z-1 and indeed, since then the Ricoh has hardly been used.
   
Senior Member

Registered: December, 2006
Location: Lincoln, UK
Posts: 229
Review Date: May 27, 2011 Recommended | Price: None indicated | Rating: 10 

 
Pros:
Cons:

My first SLR was a KX and my wife bought it for me secondhand as an engagement present 35 years ago. It eventually needed a good service about 5 years ago but other than that it is still going strong.

It is rugged workhorse. The MX was out but I chose this as it had the mirror lock up and to my mind a better finder display. I also find the MX to small. It has been round the world several times and never faltered.

I paid for my first LX by selling the photos I had taken with this. Since then, it has taken a slight back seat to the LX but it always the backup body. It used to be much cheaper secondhand than the K1000 but not anymore. They now seem to be keeping their value like the MX.

Kim
   
Veteran Member

Registered: August, 2011
Location: Austin, Texas
Posts: 328

1 user found this helpful
Review Date: November 9, 2011 Recommended | Price: $108.00 | Rating: 10 

 
Pros: Everything
Cons: Don't make them anymore...shucks

I have owned a number of Pentax cameras: a Spotmatic, K1000, MX, K2, K20D and now the original KX. My new baby is up there with them all. I was lucky to snatch a beautiful, virtually pristine late production black body for a rediculous price of $65. It cost me $43 more for new light seals, which was the only thing "wrong" with it. All I can say it is a pleasure to use. If there is any criticism it would be the flash sync of only 1/60, but hey, I didn't buy it for flash work. My K20D is much better there. I do a lot of macro work, so the mirror lock-up was a must-have. It works really well. I suspect I'll be using this camera as long as there is film to put in it. I love the simplicity of the match needle metering, plus I can use all my old Pentax lenses...Hooray!
   
Loyal Site Supporter

Registered: November, 2007
Location: Sparwood, BC, Canada
Posts: 12,385

1 user found this helpful
Review Date: February 29, 2012 Recommended | Price: $150.00 | Rating: 10 

 
Pros: All mechanical. Batteries only required for meter needle. Full view viewfinder including both shutter speed and aperture.
Cons: I recall none

When my original 1957 Asahi Pentax shutters got too worn, I sold it to a collector and bought a used KX with 55/1.8 lens and a mount adapter K to continue using my screw mount lenses until I could replace them with bayonet lenses. It worked hard for me, and it always worked. I traded it on an SF-1 when I was a stringer taking sports for a newspaper and discovered that my KX did not have the winder drive on the bottom. To this day, I regret not keeping it. I see that others say the viewfinder was dark, but coming from the old original, I did not find that. Perhaps the change from f/2.2 to f/1.8 compensated, but I never had troubles focusing with the camera. The screen was split prism. I frankly still prefer a viewfinder without focus aids, but with good grain, and my K10D is wearing an LL-60 screen for that reason.

I can recommend a KX to anyone who wants an excellent camera to shoot with film. For my stringer duties, I used print film, but I have a huge number of slides from my personal photography.
   
Site Supporter

Registered: August, 2012
Location: Queensland
Posts: 4,294

2 users found this helpful
Review Date: November 22, 2012 Recommended | Price: $70.00 | Rating: 9 

 
Pros: The best, last, full-size pure manual Pentax camera
Cons: A removable screen would have been good

I have read the previous well done reviews so won't go over what has already been well stated about the mechanics. Rather I will talk about how one relates to the camera. When I bought my Pentax MX in 1976, I figured I had the ultimate Pentax. I still have that one along with two others, but fast forward 35 years, and I went on to become more acquainted with the original K series. What I had dismissed as 'practice cameras' until they made the MX, gave way to a new appreciation. I first came across the KM, and immediately thought of it as a beefed-up MX, wonderful. That set me going up one more step, the last pure manual step in the K series - the KX. (The K2 had left the pure manual world and and was in the land of the battery dependent).

Do I love the KX as much as my MX? Almost, but that is just the long term relationship coming through. The KX is fabulous, and only the fixed viewing screen is a subtraction. Here is the strange part. The K1000 which was a bare bones stripped down KM, had been dismissed by me as made for beginners. Now I began to appreciate it's solid simplicity as an asset, and that beginners were best suited to the automatics that did their thinking for them. The new appreciation for the K1000 only strengthened my love for the more sophisticated KX.
There you have it: K1000, KM, KX and K2, the K family in order of price and ability, but not quality. To me, the KX is the sweet spot, without more gizmos on it than most will need, but not so many that it will spend time in the shop getting them fixed.
Anway, I stuck a Rikenone 50mm lens on my KX and it was happy to snap me this "Yesterday, Today and Tomorrow" (top photo) The lower two are with M50mm/f1.4

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