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Recommended By
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Average Price
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Average Rating
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100% of reviewers
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$113.20
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9.0
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supersize
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Description:
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This is a fast and compact standard autofocus lens.
| Weight | Length | Filter Diameter | Min. Focus | Max. Magnification | | 205 g | 3.1 cm | 49 mm | 45 cm | 0.15x | | Diagonal FOV (APS-C) | Horizontal FOV (APS-C) | Max. Aperture | Min. Aperture | Optical Construction | | 32 degrees | 27 degrees | f/1.7 | f/22 | 6 elements, 5 groups, 6 blades | | Diagonal FOV (24x36) | Horizontal FOV (24x36) | | | | | 47 degrees | 40 degrees | | | |
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Author
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Scott Rylance
Pentaxian
Registered: September 2006
Location: Australia/Geelong, Vic
Posts: 421
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Review Date: Mon January 8, 2007
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Would you recommend the lens? Yes |
How much did it cost? (U.S. Dollars): None indicated
| Rating: 8
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Pros:
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Fantastic image quality, sharp wide open
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Cons:
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Slow AF in low light. Under exposes on a DSLR.
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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.
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ccallana
Pentaxian
Registered: September 2006
Location: Folsom, CA
Posts: 319
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Review Date: Wed January 10, 2007
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Would you recommend the lens? Yes |
How much did it cost? (U.S. Dollars): $60.00
| Rating: 9
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Pros:
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Great Bokeh, fast, light, cheaper than the 1.4
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Cons:
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haven't found any yet
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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!
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john carter
Member
Registered: March 2007
Location: California
Posts: 54
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Review Date: Sun May 20, 2007
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Would you recommend the lens? Yes |
How much did it cost? (U.S. Dollars): $105.00
| Rating: 9
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Pros:
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I like this lens, it does great in all kinds of conditions.
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Cons:
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Possibly, build quality .
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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.
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WendyB
Senior Member
Registered: November 2007
Location: Grosse Pointe Farms, Michigan
Posts: 190
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Review Date: Tue November 27, 2007
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Would you recommend the lens? Yes |
How much did it cost? (U.S. Dollars): $112.00
| Rating: 10
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Pros:
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Very Sharp lens, excellent Bocca,
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Cons:
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have none so far
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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.
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hamfisted
New Member
Registered: September 2006
Location: Calgary, Alberta
Posts: 14
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Review Date: Fri December 14, 2007
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Would you recommend the lens? Yes |
How much did it cost? (U.S. Dollars): $150.00
| Rating: 9
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Pros:
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Excellent in low light conditions; dof; sharpness
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Cons:
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Crop factor on digital makes this lens a bit long for everyday use. Makes me want a 30-35 mm equivalent...
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tux08902
Pentaxian
Registered: November 2007
Location: North Brunswick, NJ
Posts: 468
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Review Date: Tue February 5, 2008
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Would you recommend the lens? Yes |
How much did it cost? (U.S. Dollars): $115.00
| Rating: 9
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Pros:
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optics, IQ, focusing, size
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Cons:
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noisy autofocus
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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%.
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ggad
New Member
Registered: February 2008
Location: Tucson, AZ / Philippines
Posts: 7
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Review Date: Thu May 1, 2008
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Would you recommend the lens? Yes |
How much did it cost? (U.S. Dollars): $35.00
| Rating: 8
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Pros:
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Fast, nice bokeh, nice color rendition, high IQ
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Cons:
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none so far
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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.
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jsherman999
Pentaxian
Registered: December 2007
Posts: 3719
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Review Date: Sat September 27, 2008
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Would you recommend the lens? Yes |
How much did it cost? (U.S. Dollars): None indicated
| Rating: 8
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Pros:
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Very, very sharp and saturated
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Cons:
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maybe build quality
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A very, very good lens - I love the images I get from this little guy.
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axl
Pentaxian
Registered: March 2007
Location: London (just about but still), UK
Posts: 3603
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Review Date: Fri October 31, 2008
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Would you recommend the lens? Yes |
How much did it cost? (U.S. Dollars): $50.00
| Rating: 9
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Pros:
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fast 50, contrast, sharpness, colours, fast AF
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Cons:
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not much, maybe looks and bit soft corners wide open
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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...
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trd300gt
Senior Member
Registered: June 2008
Location: Durham, NC
Posts: 131
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Review Date: Tue December 9, 2008
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Would you recommend the lens? Yes |
How much did it cost? (U.S. Dollars): $130.00
| Rating: 9
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Pros:
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sharp wide open, relatively cheap, light, good contrast and color
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Cons:
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noisy AF
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I love this lens. I use it wide open all the time, and still get really sharp shots
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Zivelot
New Member
Registered: October 2008
Location: Jászberény, Hungary
Posts: 8
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Review Date: Fri April 10, 2009
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Would you recommend the lens? Yes |
How much did it cost? (U.S. Dollars): None indicated
| Rating: 10
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Pros:
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Image quality.
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Cons:
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None
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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. 
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EsBee
Site Supporter
Registered: January 2009
Posts: 362
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Review Date: Sun April 26, 2009
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Would you recommend the lens? Yes |
How much did it cost? (U.S. Dollars): None indicated
| Rating: 10
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Pros:
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Excellent image quality, accurate focus, superb colors
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Cons:
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Filter Ring
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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 |
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bdery
Loyal Member
Registered: March 2008
Location: Quebec city, Canada
Posts: 780
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Review Date: Sun April 26, 2009
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Would you recommend the lens? Yes |
How much did it cost? (U.S. Dollars): $100.00
| Rating: 10
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Pros:
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Excellent sharpness, colour, metering, focus speed and accuracy
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Cons:
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None
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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.
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redpigeons
Site Supporter
Registered: December 2008
Location: NYC
Posts: 801
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Review Date: Sun June 21, 2009
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Would you recommend the lens? Yes |
How much did it cost? (U.S. Dollars): $130.00
| Rating: 9
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Pros:
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Sharp, Bokeh, Small Size
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Cons:
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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 !!
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Nick Siebers
Site Supporter
Registered: June 2008
Location: Madison, WI
Posts: 493
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Review Date: Fri August 7, 2009
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Would you recommend the lens? Yes |
How much did it cost? (U.S. Dollars): $100.00
| Rating: 10
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Pros:
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Great image quality, small and light, fast
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Cons:
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None yet
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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!
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Shooter65
New Member
Registered: April 2009
Location: Boston
Posts: 2
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Review Date: Fri September 18, 2009
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Would you recommend the lens? Yes |
How much did it cost? (U.S. Dollars): $156.00
| Rating: 7
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Pros:
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Very sharp, very fast interesting color, solid build
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Cons:
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Noisy, hunts a little too much
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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.
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yyyzzz
Site Supporter
Registered: March 2009
Location: Salt Lake City, UT
Posts: 191
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Review Date: Mon September 21, 2009
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Would you recommend the lens? Yes |
How much did it cost? (U.S. Dollars): None indicated
| Rating: 9
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Pros:
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High image quality, decent built quality
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Cons:
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Noisy focusing, plasticky filter ring
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I use this lens a lot. It produces excellent image quality when I can focus correctly. Just a fantastic little lens.
I do however have some problems. I am not sure if the problem is typical though. The focusing on my K10D is quite noisy. It sounds like lacking lubricant. It is very hard to use AF to focus correctly when I use large apertures. I have to rely on manual focusing from time to time, especially when I shoot portraits in low light. The filter ring looks plasticty, although I have never had any problem with it. Be careful and do not drop it on the floor.
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studiocrocevia
New Member
Registered: April 2008
Location: italy
Posts: 12
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Review Date: Mon October 12, 2009
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Would you recommend the lens? Yes |
How much did it cost? (U.S. Dollars): $115.00
| Rating: 9
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Pros:
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IQ, Light, Bokeh
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Cons:
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Noisy, Plastic made.
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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!
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ddekadt
New Member
Registered: August 2007
Location: Oxford, United Kingdom
Posts: 1
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Review Date: Sun January 17, 2010
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Would you recommend the lens? Yes |
How much did it cost? (U.S. Dollars): $140.00
| Rating: 9
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Pros:
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Sharpness, speed for price, fairly compact, aperture ring, lovely bokeh
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Cons:
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Filter ring, noisy AF!
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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/
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aaimard
New Member
Registered: February 2008
Location: Houston
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Review Date: Tue January 26, 2010
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Would you recommend the lens? Yes |
How much did it cost? (U.S. Dollars): $200.00
| Rating: 9
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Pros:
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fast, good picture quality
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Cons:
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AF a little slow in Low Light
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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/
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Migno
New Member
Registered: January 2010
Location: Naples
Posts: 1
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Review Date: Sun January 31, 2010
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Would you recommend the lens? Yes |
How much did it cost? (U.S. Dollars): None indicated
| Rating: 8
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Pros:
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sharp, beautiful colors
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Cons:
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ugly hexagonal bokeh if not used at full aperture
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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.
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