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Pentax Lens Review Database » Pentax K-Mount Bayonet Lenses » F Series Primes  

SMC Pentax-F 50mm F1.7

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Recommended By Average Price Average Rating
100% of reviewers $132.29 8.9
SMC Pentax-F 50mm F1.7
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Description: This is a fast and compact standard autofocus lens.


WeightLengthFilter DiameterMin. FocusMax. Magnification
205 g3.1 cm49 mm45 cm0.15x
Diagonal FOV (APS-C)Horizontal FOV (APS-C)Max. ApertureMin. Aperture Optical Construction
32 degrees27 degreesf/1.7f/226 elements, 5 groups, 6 blades
Diagonal FOV (24x36)Horizontal FOV (24x36)
47 degrees40 degrees


Add Review of SMC Pentax-F 50mm F1.7
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28 Reviews Total
Pentaxian

Registered: September, 2006
Location: Australia/Geelong, Vic
Posts: 421
Lens Review Date: January 8, 2007 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): N/A | Rating: 8 

 
Pros: Fantastic image quality, sharp wide open
Cons: Slow AF in low light. Under exposes on a DSLR.

It's a great light little lens with great picture quality and nice bokeh.
The only gripe I have with this Lens is that I have to set EV up a stop or two.
   
Pentaxian

Registered: September, 2006
Location: Folsom, CA
Posts: 320
Lens Review Date: January 10, 2007 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): $60.00 | Rating: 9 

 
Pros: Great Bokeh, fast, light, cheaper than the 1.4
Cons: haven't found any yet

This lens is awesome! I found a great deal on a slightly damaged (filter ring) lens for only $60 - found the spare part for free and voila! very nice fast 50. The Bokeh is very nice, color rendition is great. Its light, its fast - whats not to like. It doesn't get the attention the f/1.4 versions get, but I have this and the M version and love them both!
   
Forum Member

Registered: March, 2007
Location: California
Posts: 54
Lens Review Date: May 20, 2007 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): $105.00 | Rating: 9 

 
Pros: I like this lens, it does great in all kinds of conditions.
Cons: Possibly, build quality .

This lens, I purchased just to use on some of my K film bodies. I ended up liking it very much. One thing, and this is the reason for my post, this lens is the one I use to copy negatives and slides with my Pentax DL. It has a surprising flat focus plain with extension tubes. I tried my M42 50mm f1.4 and it wouldn't work so now I am back to my K mount F-50mm.
   
Forum Member

Registered: November, 2007
Location: Grosse Pointe Farms, Michigan
Posts: 190
Lens Review Date: November 27, 2007 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): $112.00 | Rating: 10 

 
Pros: Very Sharp lens, excellent Bocca,
Cons: have none so far

This by far my favorite F series lens. It is a fast sharp lens.
Having retained this lens from SF series bodies it works very well on my K10-D.
   
New Member

Registered: September, 2006
Location: Calgary, Alberta
Posts: 18
Lens Review Date: December 14, 2007 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): $150.00 | Rating: 9 

 
Pros: Excellent in low light conditions; dof; sharpness
Cons:

Crop factor on digital makes this lens a bit long for everyday use. Makes me want a 30-35 mm equivalent...
   
Pentaxian

Registered: November, 2007
Location: North Brunswick, NJ
Posts: 468
Lens Review Date: February 5, 2008 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): $115.00 | Rating: 9 

 
Pros: optics, IQ, focusing, size
Cons: noisy autofocus

This is an amazing lens. I sold my M 50/1.7 and my A 28/2.8 to buy this lens, and the purchase was totally worth it. The optics and IQ are simply amazing. Pictures come out very nice and sharp, even wide open. The bokeh is also buttery smooth. The lens is a pleasure to work with. It has one of the smoothest and precise focusing mechanisms I've ever seen. The only negative aspect of this lens is the noisy autofocus. I used it in class a couple of days ago to take photos of somebody doing a presentation. The entire class turned out when they heard the lens motor going zoom, zoom, zoooooooooooooooooooooooooooooooooom! It's not a problem for me though, since I rarely use autofocus. I recommend this lens 100%.
   
New Member

Registered: February, 2008
Location: Tucson, AZ / Philippines
Posts: 7
Lens Review Date: May 1, 2008 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): $35.00 | Rating: 8 

 
Pros: Fast, nice bokeh, nice color rendition, high IQ
Cons: none so far

Found this lens last weekend at our local St. Vincent de Paul thrift store. It came attached on a very old K1000. I wasted no time to buy it after some quick check on the glass.

This glass can take you where f2.8 can't.
   
Pentaxian

Registered: December, 2007
Posts: 4204
Lens Review Date: September 27, 2008 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): N/A | Rating: 8 

 
Pros: Very, very sharp and saturated
Cons: maybe build quality

.

A very, very good lens - I love the images I get from this little guy.



   
Pentaxian

Registered: March, 2007
Location: London (just about but still), UK
Posts: 4830
Lens Review Date: October 31, 2008 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): $50.00 | Rating: 9 

 
Pros: fast 50, contrast, sharpness, colours, fast AF
Cons: not much, maybe looks and bit soft corners wide open

I don't know what's topping me from giving this lens 10. It easily could bear mark 10.
I have waited with this review for a while, so I had chances to put this lens through it's paces.
I obtained my copy in exachange for unused medicor Vivitar zoom which was valued on £30. This lens is simply great. Sharp from wide open, but best around f2.8 - f5.6. Focus is fast and accurate with both K10 and K100. Colours, contrast are top notch. Really nice bokeh too. With 1.5x crop factor it makes great portrait lens. Build quality... well if you don't mind DA zooms, you'll be happy with this one too. Only shame it doesn't come with hood (but it's easy enough to get screw on one). All in all one of my favourite lenses so far. Well worth the money...
   
Forum Member

Registered: June, 2008
Location: Durham, NC
Posts: 157
Lens Review Date: December 9, 2008 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): $130.00 | Rating: 9 

 
Pros: sharp wide open, relatively cheap, light, good contrast and color
Cons: noisy AF

I love this lens. I use it wide open all the time, and still get really sharp shots
   
New Member

Registered: October, 2008
Location: Dorset
Posts: 9
Lens Review Date: April 10, 2009 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): N/A | Rating: 10 

 
Pros: Image quality.
Cons: None

There is nothing much to complain about when talking about this lens. IMHO it has better built construction than FA version lenses (heavier and feels more solid) and definitely better than the SMC P-A 1.7/50mm. The image quality is simply great. AF speed is acceptable in most circumstances (I often shoot pictures of my sister's children who are fast as the wind. Only some missed, blurred shots out of many.)

Cons concern only the price and availability.
   
Site Supporter

Registered: January, 2009
Location: Washington DC Metro
Posts: 522
Lens Review Date: April 26, 2009 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): N/A | Rating: 10 

 
Pros: Excellent image quality, accurate focus, superb colors
Cons: Filter Ring

I am not sure if this copy was not maintained well by its previous owner(s) but when I got it, its filter ring had a tiny bend/crack which required a careful effort to screw on a UV filter. The UV filter, once on, does stay on solid. The barrel on my copy also wobbles a bit.

From reading other reviews on here and elsewhere, I think this lens seems to have a very susceptible filter ring, a contrast to the quality of the rest of the lens.


However, the deficiencies in my copy of the F 50mm f1.7 lens have zero effect on the image quality and after some testing (between this and the FA 50mm f1.4), I found out the lens focused accurately (on K20D) and the images are simply superb. I just cannot point out any single negative aspect about the images this lens produces.

These lenses are very hard to find and therefore demand slightly higher prices than the FA versions.

Click on the image to view it in a larger size
Click on the image to view it in a larger size
   
Pentaxian

Registered: March, 2008
Location: Quebec city, Canada
Posts: 1331
Lens Review Date: April 26, 2009 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): $100.00 | Rating: 10 

 
Pros: Excellent sharpness, colour, metering, focus speed and accuracy
Cons: None

My experience with Pentax 50 mm primes goes from the SMC-M f2 to the SMC-A f1,4 and now the SMC-F f1,7. I purchased the F because AF is a very nice thing to have, and comments about the f1,7 were generally very good.

This lens is not very good, it's amazing! The image quality, regarding colours, contrast, etc, is on par with the best lenses I've used. I ran some benchmark tests to compare the A f1,4 and the F f1,7. The F is just as sharp at f1,7 as the A at f1,8 (its closest similar setting). From f2 onward, both lenses behave exactly the same to my eyes, but metering seems slghtly better on the F.

The focus is noisy but extremely fast, and very accurate. Mounted on a tripod, I was unable to get better results by manually focusing my K20D than what the AF delivered. Even when using Live View and the magnifier, the AF system was on the mark each time, and much faster than me...

The lens lacks the "tank" feeling of M lenses (and, to some extend, A lenses) but it's very nicely built nonetheles. My particular copy looks brand new, without a scratch or mark even after many years of use. The dark gray colour looks pretty nice on my K20D. The aperture ring is not very nice to use (though the lens will remain on the A position at all times). The focus ring is thin, but extremely well damped, much better than regular AF lenses. Its throw is shorter than the A f1,4, but that makes sense since the AF is so reliable.

Since I was never confortable using my A f1,4 at its widest aperture, I have lost nothing by switching to the f1,7. This lens is a welcome addition to my kit, and one that will serve me many years.
   
Senior Member

Registered: December, 2008
Location: NYC
Posts: 834
Lens Review Date: June 21, 2009 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): $130.00 | Rating: 9 

 
Pros: Sharp, Bokeh, Small Size
Cons:

I LOVE LOVE LOVE this lens

The image quality is absolutely stunning even wide open

I got mine for $130 which is an amazing price for such an amazing 50mm lens.

The only thing is that the lens made of plastic and not metal ... it could not bother me less but some people might have an issue

Highly highly recommended !!
   
Site Supporter

Registered: June, 2008
Location: Madison, WI
Posts: 705
Lens Review Date: August 7, 2009 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): $100.00 | Rating: 10 

 
Pros: Great image quality, small and light, fast
Cons: None yet

I have used this for 2 weeks straight now since I got it, and have found nothing I do not like. Small and light, so easy to carry around, quick to AF for me, and great images. Very sharp even wide open, although watch that narrow depth of field! Contrast is great, and I like the colors although they run a little cooler than other Pentax lenses. My A 50 1.4 will be on the market soon!
   
New Member

Registered: April, 2009
Location: Boston
Posts: 2
Lens Review Date: September 18, 2009 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): $156.00 | Rating: 7 

 
Pros: Very sharp, very fast interesting color, solid build
Cons: Noisy, hunts a little too much

Purchased this lens from Ador*****last Summer for portrait work on my GX-10 but it has done reasonably well with some indoor event shooting (MMA Close Work) also.

The DOF on this lens seems to lend itself more to portrait work than anything else but, I have gotten some good results when shooting interiors on manual.

These lenses seem to be getting a bit scarcer as time goes by and I'm anticipating alot of fun with this on on the K-7 I'll be picking up next month.
   
Site Supporter

Registered: March, 2009
Location: Salt Lake City, UT
Posts: 289
Lens Review Date: September 21, 2009 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): N/A | Rating: 9 

 
Pros: High resolution, contrasty, decent built quality, light weight
Cons: Noisy focusing, plasticky filter ring, PF, getting pricy for a film era lens.

I use this lens a lot. Just a fantastic little lens. Lightweight. High IMQ. Unique optical formula (different from 50mm f2, f1.4 or f1.2)

Built quality may not be on par with older K or M manual lenses. Filter ring seems to be made of hard plastic. Have seen many broken filter rings. Getting more expensive recently.

I do however have the same problem with three copies of the lens I have used. The focusing on my K10D is quite noisy. It sounds like lacking lubrication. It is very hard to use AF to focus correctly when I use large apertures (EDIT: on my K-x, focusing is doing great). I have to rely on manual focusing from time to time, especially when I shoot portraits in low light. The filter ring feels plasticty, although I have never had any problem with it. Be careful and do not drop it on the floor.

EDIT: PF is evident especially at f1.7 under certain lighting situations. This is not surprising for a film era lens. Pentax needs to upgrade this prime lenses. DA 55mm is just out of reach of common people.
   
New Member

Registered: April, 2008
Location: italy
Posts: 12
Lens Review Date: October 12, 2009 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): $115.00 | Rating: 9 

 
Pros: IQ, Light, Bokeh
Cons: Noisy, Plastic made.

This is my always on prime lens. It's very sharp, little and well made.
It's a perfect Portrait and Still life lens !!!

The only problems are that focusing is a bit noisy and quite slow.

With K20D gained a second life, i had Ist DS but now with K20D this lens is amazing!
   
New Member

Registered: August, 2007
Location: Oxford, United Kingdom
Posts: 1
Lens Review Date: January 17, 2010 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): $140.00 | Rating: 9 

 
Pros: Sharpness, speed for price, fairly compact, aperture ring, lovely bokeh
Cons: Filter ring, noisy AF!

I recently landed one of these on the market place, and think I will probably offload it soon. That's not because I don't like it, it just doesn't quite meet my needs.

It's really very sharp, and I quite like the focal length... the bokeh is lovely. My version is unfortunately filter-ring-less, the filter ring was broken when I bought it and broke off fully with some use. With some glue and creativity I fixed it, but it's rather ugly now - a real risk with this lens it seems.

The noisy AF is a bit irritating... otherwise, I like this lens, produces some really special images.

Some examples:

http://www.flickr.com/photos/dandekadt/4210070664/

http://www.flickr.com/photos/dandekadt/4186000140/

http://www.flickr.com/photos/dandekadt/4185236391/

http://www.flickr.com/photos/dandekadt/4185987620/

http://www.flickr.com/photos/dandekadt/4539465634/ (wide open)
   
New Member

Registered: February, 2008
Location: Houston
Posts: 3
Lens Review Date: January 26, 2010 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): $200.00 | Rating: 9 

 
Pros: fast, good picture quality
Cons: AF a little slow in Low Light

Upgraded from a Manual A 50mm f2 lens to this one.
AF is definitively a great improvement

Bokesh is really nice and lens is fast..

enjoying it but need a little more time to really appreciate all of it

http://www.flickr.com/photos/aimard/4298737899/
   
New Member

Registered: January, 2010
Location: Naples
Posts: 7
Lens Review Date: January 31, 2010 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): N/A | Rating: 8 

 
Pros: sharp, beautiful colors
Cons: ugly hexagonal bokeh if not used at full aperture

Well, it's the same optical scheme used in the K, M, A and FA series. It simply has the same optical features as its "cousins". It doesn't seem to be so rock solid, sometimes I'd like to hang it tight into my hand to stay as still as I can, but I prefer not to.
   
New Member

Registered: January, 2010
Location: luxembourg
Posts: 2
Lens Review Date: April 14, 2010 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): N/A | Rating: 9 

 
Pros: sharp,IQ
Cons: ?

This is the best lens I own yet on a Pentak body. Seems to me better that Canon 50 1.8
   
Senior Member

Registered: January, 2008
Posts: 871
Lens Review Date: May 10, 2010 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): $300.00 | Rating: 8 

 
Pros: Sharpness, colour, weight, size
Cons: Build quality, backlight handling, AF action (k200d), a bit pricey on used market

Having used DA70/2.4, M50/1.7, M50/1.4, SMC55/1.8, Helios 44m 58/2 and two samples of F50/1.7, i can say that even some of them are so close it's hard to tell, this might be the sharpest lens of them all.

What is nice about this lens, that it brings excellent image quality and speed in small and light package.

With F50/1.7 contrast drops rapidly under bright light, when with DA70/2.4 i could shoot subject against bright background with excellent results.
DA70/2.4 lacks aperture speed, but in the same time AF doesn't get confused by strong backlight and is much more responsive under dim light.
Because of this it is hart to utilize the full capability of F1.7.
   
New Member

Registered: July, 2009
Location: Cambridge
Posts: 4
Lens Review Date: June 15, 2010 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): $285.00 | Rating: 10 

 
Pros: Very sharp, IQ, color rendition
Cons: hard to find a copy with excellent condition

I had FA 50mm/1.4 and then got this copy. I would say this lens is pretty good even at wide open. The image is very sharp and color rendition is very good. After using the two lens, I kept this guy and let the FA 50/1.4 go. Would recommend you have one especially you can find one in excellent condition!c
   
New Member

Registered: June, 2010
Location: Southampton
Lens Review Date: June 19, 2010 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): $80.00 | Rating: 8 

 
Pros: Excellent quality compared to the modern DA lenses
Cons: None

The sharpness of the images taken with this lens are just so much better than the Pentax DA 18-55 and Tamron 70-300 Macro. It's small and compact, which is convenient. I picked one up second hand ina photo shop in Southampton for the equivalent of about $80, next to nothing.
   
Site Supporter

Registered: May, 2010
Location: PERTH
Posts: 10
Lens Review Date: June 22, 2010 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): $170.00 | Rating: 8 

 
Pros: very sharp,small,fast AF
Cons: loud AF,

Just got it from E bay,vary sharp lens I can only compare to FA1.4 it looks a tad sharper, it is smaller then FA 1.4, it will stay on my camera.
   
Pentaxian

Registered: June, 2008
Posts: 204
Lens Review Date: July 22, 2010 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): $195.00 | Rating: 9 

 
Pros: Very sharp, fast prime lens
Cons: Manual focusing ring a bit small

The lens is really sharp and takes great pictures, great for everyday use. Very good choice, especially considering the price.
   
Site Supporter

Registered: April, 2009
Location: port townsend, wa
Posts: 419
Lens Review Date: August 30, 2010 I can recommend the SMC Pentax-F 50mm F1.7: Yes | Price (U.S. Dollars): $50.00 | Rating: 10 

 
Pros: Sharp, good color, great bokeh
Cons: slightly noisy auto-focus

Okay, I got a super price for this lens, but I would have spent three or four times as much. In almost all regards this is the equivalent of the FA 1.4 50mm. Okay, it's a third of a stop slower, but that lens is pretty soft wide open. This is every bit as good at 1.7 as that is at 1.8. The only other negative, if you can call it that, is that this lens has a bit more focus noise. Not that the FA 1.4 is quiet. That's it, all the negatives. Build quality is equivalent, it's plastic but well constructed. This has full auto exposure and focus, and works on modern cameras. I would not trade my copy for a new FA 1.4.

With the 2010 price of the FA 1.4 fluctuating between $360 and $400 US, those are incredibly tiny negatives if you can score a copy of this lens in good condition. This is sharp, fast, and focuses better than my copy of the 1.4 did. without in camera adjustment. Cast is slightly cooler than the FA 1.4 but that's what white balance is for. Colors are nicely saturated. Bokeh is buttery. I can detect no distortion and it has excellent edge sharpness from F4 up. What's not to like?


1/2 second, f-5.6 ISO 200, tripod mounted. Standard ACR conversion sharpening. 50% crop.
Add Review of SMC Pentax-F 50mm F1.7



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