Originally posted by gatorguy Between a Sigma 17-50 2.8 ( cheap but great performance on APS-C) and the 12-24 I have no reason to add the 15-30. Besides I can't really afford it either
Anyway, spent the entire morning shooting landscapes with the 12-24, short hike of 4.9 miles in just over 3 hours so very casual. I usually carry a prime telephoto and a macro when I do this, but darn happy with the shots I got today. This lens is much better than I gave it credit for.
As an aside I thought you already had the FA31. On APS-C I've not been overly impressed. Really nice imaging but not great IMO. I personally suspect the new HD FA35 will handily outpace it on even FF so not a bad idea to wait unless you stumble on a really cheap copy of the 31
Were you using the 12-24 on K-1 as well (ff mode)?
I hear a lot of people feeling indifferent about the 31 between the two bodies. I think that's because it tips over into two different 'genres'. On FF the 31 is the beginnings of being a wild angle, the start of a landscape lens, but also still portrait, on crop it becomes a more straight up portrait lens. The 31 on the K-1 becomes a super duper 'environmental portrait' lens, something that gets you the person and where they are in one shot (street photography etc), on crop not quite so much but instead concentrates to being a classic portrait (effectively behaving like a 46.5/2.7 FF portrait lens).
I firmly believe much of the goodness in lenses actually is at the edges, and with FF glass on crop bodies you're missing that. Someone I know recently bought a DFA50 for their K-70. I find that a perplexing buy indeed. Why the DFA costs so much in the first place is that the edges of the lens are sharp, yet on a crop body yer basically throwing away $$ by never taking advantage of that (you never see the true edge). I mean ok, maybe that sounds harsh, I mean they still get a nice fifty, AW, Quick Shift, Silent AF, good AF etc, but still... one of the major optical benefits of the lens is a FF FoV with really good edge sharpness at wide open apertures.
I feel similarly about the FA Ltds (and the Tak 50). Although not having sharp edges, there is wonderful magic happening throughout the frame, from centre to edges. Watch the magic disappear when you apply lens correction to a f2 shot with a FA ltd. Optically flawed glass? Yep, but with that flawness comes some beautiful rendering. I'm starting to believe you can't have it both ways, the DFA 50 is clinical and perfect, but I'm not feeling the magic quite so much, the FA ltds flawed but they do have magic. I'd prefer to use a DFA 50 for product photography however, you
need that hardcore clinical perfection for that genre.
I only care about edge sharpness when it matters, I don't care if the edges are soft if there is not a primary focus there. A straight up centre portrait shot, who cares if the oof edges are sharp or soft?! In cases like this it's not important at all. Going back to
@beachgardener recommendations for a 35mm, the Sigma 35/1.4 Art is probably the best 35mm for Pentax if considering edge sharpness is important (which it can be for groups if you're struggling to squeeze them into the frame and want good subject isolation).