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Forum: Pentax SLR Lens Discussion
02-12-2019, 02:06 PM
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I have the Sigma 35 Art for quite some time and I have been using it for portraits. I don't have the Sigma 17-50, but I don't think it can hold its own against the 35mm Art, which is optically superb (later edit: only at 35mm, the 17-50 probably wins when it comes to other focal lengths).
I did use it on the K5IIs, now I have the K-1 but before using it on the K-1 I will send it to Sigma for mount replacement, in order not to scratch the mount of the K-1.
Regarding the unreliable focus: I think for my copy it is present, but I'm not really sure. About 10% or less of the shots are affected, but I never made any serious tests, it could be the AF of K5IIs which is not GREAT by any means or my poor technique, using focus and reframe at f1.4 and stuff like that. I would say it's a little bit weird. The vast majority of low light shots are ok, but sometimes it misses focus in clear daylight.
If you're shooting in studio, can't you use contrast AF in liveview? that should resolve any focusing issues. Also, there is a deck available for calibrating the lens. Or you can just test your copy and return it if you see any problems.
Some portraits below with Sigma 35 Art on the K5IIs, feel free to click to images to go to full res version on Flickr.
 Through the mirror by Hattifnattar, on Flickr
 Geology field trip by Hattifnattar, on Flickr
 Compact portrait by Hattifnattar, on Flickr
 Patricia by Hattifnattar, on Flickr
 Patricia by Hattifnattar, on Flickr
 Diana by Hattifnattar, on Flickr
I also have some studio shots with the 35 Art but those are NSFW so I cannot post them here.
Other options: well, first thing that comes to mind is FA 31mm, which is also a bit wider.
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