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Forum: Pentax Film SLR Discussion 11-15-2020, 05:58 PM  
35mm that can reliably do double exposure
Posted By noblepa
Replies: 54
Views: 1,904
I have taken a few double exposures with my Spotmatic. As LesDMess suggests, taking up the slack by turning the rewind crank helps. On the Spotmatic, you take a double exposure by pressing the rewind button on the bottom of the camera to disengage the film advance mechanism, before cocking the shutter. The film advance has a tendency to move the film a little bit, even with the rewind button pushed.

I must admit, though, that in the few (deliberate) double exposures I have taken, I was never too concerned about the film being registered at exactly the same position between shots.

I was always more disappointed by the fact that I had to sacrifice the next frame, because it typically takes the film advance about half a frame to re-engage, so the next frame is only advanced half a frame. You must then advance another full frame to make sure that you don't inadvertently get a triple exposure.

---------- Post added 11-15-2020 at 07:59 PM ----------



Yes, that is definitely a C-3 Matchmatic.

The selenium meter would be long-dead by now, anyway.
Forum: Troubleshooting and Beginner Help 11-05-2020, 12:54 PM  
Issue with Aperture ring on A Series lens (50mm f1.7)?
Posted By noblepa
Replies: 12
Views: 462
The OP made a point of saying that he had set the camera to permit the use of the aperture ring. Double check that.

If he is still getting the "F---" on the top LCD, that means that the camera is not recognizing that the lens is in A mode.

If the lens is, indeed, in A mode, then cleaning the pins on both the camera and the lens might help.

If the lens is not in A mode, try getting the aperture ring to the A setting. If that is not possible, as others have said, you will have to shoot wide open. That kinda sucks for a couple of reasons: f/1.7 is probably not the sharpest aperture for that lens, and you will have minimum depth of field. The latter may be okay for some shots, but for most shots, its nice to have at least moderate depth of field.
Forum: Pentax DSLR Discussion 11-04-2020, 07:36 AM  
Why was the aperture simulator scrapped, and can it come back?
Posted By noblepa
Replies: 15
Views: 1,061
This sounds a little like the suggestion that surfaces periodically, to produce a "digital K-1000". That is, a bare-bones camera, all manual, like the classic film camera.

The problems are several fold.

First, as much as those of us here might like such a camera, there is virtually zero market for it outside of this and similar forums.

A little money might be saved by omitting the auto-focus motor, but, again, the general photo market place has come to expect auto focus in all cameras.

Adding the aperture simulator lever would be a physical change that would cost real money, and appeal only to those few who use manual lenses. Again, a very limited market.

Most of the features in modern digital cameras are software-driven. That means that the costs of development have already been spent. I'm sure that the firmware in Pentax cameras (as well as Nikon, Canon, Fuji, Sony and all the rest) is modular and reused from one camera to the next, with minor modifications. So, no savings on development costs.

It costs the same to burn 10GB of firmware onto the microchip as it would to burn 1GB. So, little to no difference in manufacturing cost. Therefore, no reduction in the retail price.

The net result of all this is that such a camera would have limited market potential, which would drive the cost up, with no savings in manufacturing costs. It would be a high-priced, niche market camera. Pentax doesn't have the brand recognition or loyalty to produce a niche camera.
Forum: Pentax Film SLR Discussion 09-17-2020, 07:06 AM  
My grail, the original, the one and only, "AP" Asahi Pentax
Posted By noblepa
Replies: 40
Views: 2,348
Now, if you could only get an AP-50 to go with it. Sadly, Pentax only made one, to commemorate the 50th anniversary of the original AP. It was a bone-stock K10d, with a silver and black body, with a pentaprism cover that is very reminiscent of the AP.

Not to hijack this thread, but I noticed in the advertisement, posted earlier, that the address for Asahi Optical was in New York. I always thought that, after WWII, the Japanese companies worked with American companies to import their cameras, as setting up a US subsidiary could be expensive and risky. Plus, the Japanese were short of hard currency in the aftermath of the war. In the case of Pentax, this was Heiland, which became (or was purchased by) Honeywell. Does anyone know the history?
Forum: Troubleshooting and Beginner Help 08-26-2020, 10:38 AM  
20mm Mitakon Zhongyi macro stuck on K1
Posted By noblepa
Replies: 12
Views: 697
I had a similar experience with my K10d and a t-mount 500mm mirror lens. We were about to embark on a seven day cruise, when I put the lens on the camera. I was using a k-mount t-adapter.

It turns out that, since the k-mount has three "lobes", it is possible to insert the lens rotated 1/3 turn. That's what I did. As soon as I put it on, I realized what I had done, but it would not come off.

I took it to a local camera shop in San Diego (who incidentally had Pentax cameras in stock) and with their help and the loan of a few tools, I was able to brute-force it off. I did not have to disassemble either the camera or the lens. Fortunately, it did not damage either the camera or the lens. The t-adapter would have been trivial to replace, and I only paid a few bucks for the lens on ebay.
Forum: Pentax Film SLR Discussion 08-25-2020, 07:50 AM  
Question regarding the mirror box Pentax Z10 / Z20 AF SLRs - What is this part?
Posted By noblepa
Replies: 5
Views: 502
This is just a wild guess.

I don't think its the light meter. That is built into the pentaprism.

I think that it may be the sensor for the TTL flash control. Some of the Pentax cameras from that era controlled the flash by reading the light reflecting off of the film during the exposure and quenching the flash when it decided enough light had reached the film.

It was not until the second generation of Pentax dslrs that they added the p-ttl pre-flash and used the viewfinder mounted light sensors to read the light with the mirror down.

But, I've been wrong before.
Forum: Troubleshooting and Beginner Help 08-13-2020, 06:58 AM  
Pentax K-7 shake reduction with manual zoom lenses
Posted By noblepa
Replies: 23
Views: 1,168
I think that his point is that, since the lens if larger and heavier than an ordinary 80mm lens, you will be more likely to move the camera that you would with a lighter 80mm prime lens.

I don't know if this is true, but it doesn't seem entirely implausible to me.
Forum: Visitors' Center 06-15-2020, 04:40 PM  
Pentax k-1000: Changing lenses with film loaded
Posted By noblepa
Replies: 5
Views: 508
To the OP, who is apparently not completely familiar with the K-1000:

Just remember that the light meter on the K-1000 is always on. When not using the camera, it is imperative that you put a lens cap on the lens. Failure to do so will cause the battery in the light meter to go dead. Other than a dead battery, it will not harm the camera.

If you were aware of that, I apologize, but that is a common mistake made by those new to the K-1000.

It is a wonderful camera. Its no wonder that film-based photography classes still recommend it.
Forum: Troubleshooting and Beginner Help 02-07-2020, 08:07 AM  
Spotmatic just got serviced, but mostly unexposed rolls of film
Posted By noblepa
Replies: 10
Views: 683
The Spotmatic has two distinct gear trains; one for speeds of 1/60 or slower and another for speeds of 1/125 and faster. As Pentaxus stated, the higher shutter speeds may need adjustment. It is possible that the leading (or opening) shutter curtain is dragging, allowing the trailing (or closing) curtain to catch up. Normally, the opening and closing curtains form a moving slit that travels across the film plane. The higher the shutter speed, the narrower the slit.

As others have pointed out, the "Auto" setting on a Spotmatic lens does not control the aperture setting. It is now considered somewhat of a misnomer. Before the 1960's, lenses were often completely manual or "preset". With a manual lens, you must set the aperture yourself. With a preset lens, there are two aperture rings. One has the normal detents for the various f/stops and the other simply closes the iris to the preset aperture.

In the late fifties/early sixties, lenses began to appear on the market that stayed open until the moment of exposure. Then, the camera "automatically" stopped the aperture down to the selected value. You still had to manually set the aperture on the ring, but on Pentax screw mount lenses, there is a little silver pin on the lens. When you press the shutter release, the camera pushes that silver pin, stopping the lens down to the shooting aperture.

However, if you had the lens on auto and left it set at the widest aperture, you still should see images on the negatives, albeit severely overexposed. If the film is truely blank, I would look for film advance issues or shutter issues.

I suggest you run a test roll through the camera, using one exposure for each possible shutter speed. Don't worry too much about getting a "proper" exposure; you just want to have each shutter speed used. All frames should have something recorded. If, for example, they all look good up to 1/60 second, but 1/125 and faster have no exposure, then you clearly have a high-speed shutter train issue. They may be okay to 1/250, for example, but fade out at faster speeds. That would mean that the gear train is working (although it may still need adjustment), but that the trailing curtain is catching up to the leading curtain. Remember, at higher speeds, that moving slit is pretty narrow. I believe at 1/1000, the slit is only 4 or 5 mm wide, so it wouldn't take much for the leading curtain to slow enough to allow the trailing curtain to catch it.
Forum: Pentax SLR Lens Discussion 12-23-2019, 11:45 AM  
SR with Sigma AF 18-250mm f3.5-6.3 DC OS HSM Lens
Posted By noblepa
Replies: 1
Views: 584
I just purchased this lens. It is my first Sigma lens.

It has in-lens Optical Stabilization, despite being a Pentax mount lens.

I plan to use it on my K-5.

My question is, how does the in-lens stabilization work with the in-camera stabilization in my camera?

Should I turn one or the other off?

If I leave both turned on, will the stabilization systems become confused and work against each other?

Thanks
Forum: Pentax DSLR Discussion 12-17-2019, 01:16 PM  
The K10D Club!
Posted By noblepa
Replies: 6,515
Views: 625,518
I have a couple of non-Pentax adapters. I put the adapter on the lens and leave it there, so each lens has a dedicated adapter, essentially turning it into a K-mount.

I removed the spring clip from all my adapters. I have never had a problem with the lens coming loose during focusing. They fit very snugly and normal use doesn't affect them. May impression is that they are just as secure as the M42 lens was on my Spotmatic. There was no locking mechanism on that camera or those lenses and I never had a problem with the lenses falling off or coming loose.

I know that many here swear by the OEM Pentax adapter and swear AT the non-OEM ones. Personally, I have never had a problem. As always, YMMV.
Forum: Troubleshooting and Beginner Help 10-03-2019, 11:14 AM  
Reversed Light Meter?
Posted By noblepa
Replies: 3
Views: 694
Welcome!

A word of caution about the Spotmatic F. The lightmeter is always on, unlike the earlier Spotmatics. There is no on/off switch for the meter.

This means that a lens cap or body cap is essential. Otherwise, the meter will constantly draw current from the battery, exhausting it very quickly.

As others have already pointed out, the slider on the lens mount merely stops the lens down for depth-of-field preview.
Forum: Troubleshooting and Beginner Help 08-12-2019, 12:55 PM  
K-x flash question
Posted By noblepa
Replies: 2
Views: 523
Just to ask the obvious question; do you, perhaps, have the shutter speed set faster than 1/250 second in manual mode?

Pentax dslrs will not fire the flash above the sync speed of 1/250, unless you have a flash capable of HSS.

Since I doubt that the Elinchcron flash trigger is capable of doing HSS on a Pentax camera, it won't fire with the shutter faster than 1/250.
Forum: Troubleshooting and Beginner Help 06-18-2019, 11:48 AM  
How to connect to pc
Posted By noblepa
Replies: 9
Views: 1,533
I recommend that you forget you ever heard of the USB connection between your camera and your computer.

I say this because the USB connector in the camera is mounted to the motherboard of the camera. Unfortunately, in most Pentax models, the only thing that physically secures the connector to the mobo are the solder joints to the copper trace lines on the phenolic plastic mobo base. This is a very (VERY) weak physical connection.

The least little bit of lateral force when connecting/disconnecting the USB cable can easily tear those very thin copper traces. The only practical repair is to replace the motherboard, which is very, very expensive, especially for an older camera.

Just remove the SD card from the camera and put it in the computer's SD card slot. It probably has a faster transfer rate, as well.
Forum: Troubleshooting and Beginner Help 03-12-2019, 08:51 AM  
lens id question
Posted By noblepa
Replies: 12
Views: 879
A good, free image processor that is probably better than what came with Windows, is Fastone Image Viewer.

Its nowhere near as flexible or powerful as Photoshop Elements, or Lightroom, but its free and it will do all of the basics, such as resizing, cropping, color correction, etc.
Forum: Pentax K-5 03-11-2019, 11:34 AM  
Difference between M and K lenses
Posted By noblepa
Replies: 29
Views: 3,197
Just be careful when buying used lenses. The last of the M42 screw-mount lenses were also labeled as SMC or Super-Multi-Coated. An SMC lens can be either M42 or K-mount.
Forum: Pentax DSLR Discussion 02-21-2019, 11:44 AM  
3rd party battery grip
Posted By noblepa
Replies: 13
Views: 1,046
I have a Neewer grip for my K5. Haven't had it long, but it seems to function perfectly. The build quality seems pretty good.

The only thing I don't like is that unlike the DBG2 clone I had for my K10d, there is no slot to hold the Pentax Remote F. But that is Pentax's fault, not Neewer's. Pentax left that feature off the real DBG4.

Mine came with battery trays for both the D-Li90 and AA's. I haven't had a chance to use the latter, however.
Forum: Pentax DSLR Discussion 02-20-2019, 10:05 AM  
Using K10D with a P-TTL flash
Posted By noblepa
Replies: 14
Views: 1,165
Yes, P-TTL is specific to Pentax cameras. Nikon and Canon have I-TTL and E-TTL (I can never remember which is which), which are basically the same thing.

With P-TTL, the flash fires a pre-flash while the shutter is still closed. The light returning to the camera is read by the light sensors in the prism. The camera determines the correct aperture and fires the flash again, with the shutter open, to record the image. Normally, the two flashes are so close together that you can't see them. However, if you put the flash in trailing sync mode and set a long exposure time of, say, one second, you will very clearly see the two flashes.

The flash makers and retailers are getting a little loose with the terminology. Back in the film days and in the very early digital days, there was a flash system called TTL. In this system, only a single flash was used and a meter in the mirror box read the light reflecting off of the film or the digital sensor and quenched the flash to control the exposure. No current Pentax cameras support TTL. All current cameras support P-TTL. Only the very early Pentax digital cameras, such as the ist* and a couple of others supported TTL.

Many manufacturers are advertising their flashes as being "TTL" flashes, when in fact, they are P-TTL, I-TTL or E-TTL. Its not so much of a problem with brand new flashes, since I don't believe anyone still makes a TTL flash. However, on eBay, it is very confusing, because many eBay sellers don't know the difference. Even if you ask them, some of them can't answer.

Someone correct me if I'm wrong, but I believe that a TTL flash has three contacts on the hot shoe, the original manual sync contact in the center of the shoe, and two smaller contacts below that. These allow the camera and the flash to communicate. P-TTL flashes have four contacts; the manual sync contact, the two below the center contact, and an additional one above and to the left (I believe) of the center contact.

So, if you're buying a brand new flash, just make sure that you buy a model that is dedicated to Pentax cameras. A Nikon or Canon dedicated flash will not work with a Pentax camera.

If you're buying from eBay, look for a photo of the bottom of the hot shoe. If there are four contacts, and it is dedicated to Pentax cameras, you're good to go.
Forum: Pentax DSLR Discussion 01-22-2019, 07:43 PM  
The K10D Club!
Posted By noblepa
Replies: 6,515
Views: 625,518
I remember reading a review of the K10d, back when it was in production. Don't remember where I read it, but the reviewer said something like "this camera cries out for raw files", and went on to explain that the raw files it produced were superb.
Forum: Troubleshooting and Beginner Help 01-02-2019, 03:38 PM  
Pentamirror
Posted By noblepa
Replies: 10
Views: 1,014
Since it is a Penta-Mirror, I assume that it is made up of five separate mirrors, unlike a Penta-Prism, which is a single block of glass, with five faces precision ground onto it.

I have to believe that the positioning, as well as the size, of the five individual mirrors is critical and that factory has special jigs to hold them in place, while it is being assembled. These jigs would not be available to the public, and would probably be difficult to fabricate, especially without knowing the exact angles and dimensions of the mirror assembly.

So, my not-so-educated guess would be that, no, a pentamirror is NOT replaceable, at least not by anyone lower in the parts chain that an authorized repair facility. Like many other repairs to these cameras, I strongly suspect that it would be cheaper to buy a good, used camera.
Forum: Troubleshooting and Beginner Help 12-27-2018, 11:50 AM  
Pentax Auto 110 Shutter Doesn't Work
Posted By noblepa
Replies: 2
Views: 1,065
By a strange coincidence, I just happen to have my Auto 110 on my desk at work.

The Auto 110 does, indeed, require two throws of the advance lever to cock the shutter.

The camera does not need film to fire.

I removed the batteries from mine and it still fires.

Not sure what could be wrong with yours. I have never had mine open, so I am not familiar with the internal workings.
Forum: Pentax DSLR Discussion 12-26-2018, 09:33 AM  
All I want from Pentax for Xmas
Posted By noblepa
Replies: 17
Views: 1,658
Leica is a special case. They have a history of selling wonderfully engineered cameras and lenses. For decades, they have been the pinnacle of quality, both in design and manufacture.

However, what works for Leica doesn't necessarily work for other manufacturers. People pay a lot of money for that little red dot on the front of the camera.

No one else sells a true rangerfinder camera. Leica does. That doesn't mean there is a large market for rangefinders. There is a market for LEICAs.

Leica sold a digital camera that was incapable of taking color photographs. Would that fly in the wider market? I doubt it.

Comparing Leica to the general digital camera market is like asking why Chevrolet can't build a car with the same features and quality as a Bentley or Rolls Royce. Just as with a Bentley, a good portion of the price you pay for a Leica is for the exclusivity and the bragging rights.
Forum: Troubleshooting and Beginner Help 12-24-2018, 12:15 PM  
Focus issues with old M42 lenses
Posted By noblepa
Replies: 11
Views: 821
This one allows infinity focus: Pentax M42 Screw Mount to Pentax K-Mount Adapter ***** | eBay

This one does not: M42 Lens to PK K Mount Adapter Ring For Pentax Camera K-1 K-3 K-3II K-50 K-70 K7 155397368902 | eBay

If your adapter looks more like the second one that the first, that is your problem.
Forum: Troubleshooting and Beginner Help 12-17-2018, 09:16 PM  
Manual to Automatic
Posted By noblepa
Replies: 6
Views: 629
What you probably did was set "Allow aperture setting other than A" on. This is set off by the factory (for no reason anyone has ever been able to find).

Without knowing what camera you have, its difficult to tell you exactly where in the menu this setting lives.

The good news is that you don't need to worry about it. The setting ALLOWS the use of manual aperture lenses. It doesn't REQUIRE it. Just mount you new 50mm automatic lens (which lens?) and fire away.

Most everyone here who ever uses manual lenses on their Pentax dslr enables that value and leaves it enabled.

Please come back and tell us what camera and what lenses you are using. It will make it a little easier to discuss.
Forum: Troubleshooting and Beginner Help 12-13-2018, 09:10 AM  
Does any Pentax K10D equipment work on ...
Posted By noblepa
Replies: 12
Views: 1,156
Maybe I was lucky. My flash is a Promaster FL160. It seems to work properly on both cameras. The only issue I have (and had on the K10d, as well) is that the flash foot does not always slide all the way into the camera's hot shoe. I have to push very firmly to get it to seat completely.
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