Reviews and Problems with Pentax SMC DA 17-70 mm f/4 AL (IF) SDM
Showing 1-10 of 53
11 November 2013
Excerpt: If this lens were 17 to 50, I would probably give it a 9. The issue I have with this lens is autofocus of distant images from 50 to 70 mm. I don't know why this is but on both my K10D and K5 I have the same issue with this lens. Zoom wider than 50mm and the autofocus is perfect, quick and accurate but above 50 mm on a distant subject, it sometimes just cannot get a fix on a subject near infinity and just does not autofocus reliably.
Pros: Versatility, sharp for a zoom, build quality
Excerpt: I bought the lens used from another forum member here and used it on a K100d Super until very recently when I bought a K-5. The lens SDM worked well on the camera, as advertised. Before this lens, I used the 18-55 II, which is quite good, but this one is well worth the extra cost. The sharpness is better across a broader range, but the most noticeable change is the rich, vibrant colors. The colors are richer with this lens than they were with a circ polarizer on the II.
Pros: Colors!, Sharp, Great range, Constant aperture
Cons: Harder to focus manually, Fails to lock focus infrequently
Excerpt: Three months have been using this lens. First to K-7, now with the K-5. Somewhat surprising is the amount of criticism about the autofocus. My copy everything works fine. Focuses very quickly and accurately. Bought a used lens, which has already been 4 years. And not at all disappointed with the quality of the picture ...
Pros: sharp, picture quality, constant aperture
Cons: loose front lens. I sometimes get worried about it. low luminosity
Excerpt: I got this lens to replace my 18-55 WR. The autofocus tended to hunt and so I sent it in for repair. That cost me ~100$. Next the SDM motor failed twice within the hour I got it back from service. The lens has been repaired under warranty both times. However i could not trust this lens anymore and therefore sold it.
Pros: sharpness, contrast, zoom range, constant aperture, very good image quality at f/4 already
Cons: SDM failed multiple times on my copy, autofocus tends to hunt at 35-70mm range, CA's could be a little better but can be easily corrected in pp
Excerpt: This is my workhorse lens, its quite versatile, constant aperture is very convenient and is reasonably sharp, although not up to standards set by limiteds. But nobody expects this lens should compete with limited primes for IQ.
Excerpt: Firstly, let me say that the autofocus on this lens is near silent, there is a tiny high pitched sound but that is how sdm works, duh. This lens is a workhorse, I can get good macros with good bokeh out of it, the zoom ring is nicely damped, sharpness is quite good even at f4 and at 17-60mm the sharpness is very good, it is so much better than my Tamron 17-50, it is a little soft at 70 but at f6.3 it is pretty ok.
Pros: sharp, good macro, good handling, quick af, constant f4, good colors
Pros: Focal length, constant aperture, accurate AF but see cons, no zoom creep, bokeh at 70mm f4, decent image sharpness, size and weight, very nice lens hood with little window for polarising filters
Cons: Compared to Canon EF 17-70mm f4 L USM and EOS 40D: turning AF ring extremely annoying and touching it can damage the AF motor during AF, slower AF with noticeably louder (high pitch) AF noise, no zoom lock when you walk; very likely that the lens will ext
Excerpt: This COULD have been a great lens. Optically the 17-70 has the chops to be an excellent all-purpose wide zoom but it shows a clear "lack of focus" on the part of management at Pentax. At times I really like this lens. At other times I hate it.
Pros: IQ "CAN" be excellent when stopped down a bit