Originally posted by photoramone
What quality of images do you all imagine we will get (FF) with our Pentax 12 to 24mm lenses. Will it work well or much it be cropped? RJM
The Pentax 12-24 is not a full-frame lens, so you'll have to crop the images down to APS-C. The K-1 only has 15 megapixels covering an APS-C frame, but
it's not like the 12-24 maxes out even the Pentax K-10D 10 megapixel sensor, so I doubt you'd pull any more detail from this lens on a high-res APS-C body like the 24 MP K-3 when compared to a 15 MP crop-mode K-1.
---------- Post added 05-10-16 at 05:14 PM ----------
Originally posted by Schraubstock
The sigma 12-24 DG EX is doing just fine on the K-1.
I couldn't imagine how. The Sigma is OK in the middle (around 18mm), but it's pretty soft wide-open at 12mm (better at f/8), and basically unusable at 24mm. DxOMark doesn't see the lens ever pull more than 8-10 megapixels of detail, so it seems pretty silly to me, especially given the cost.
But! Having said that, sometimes you really, really need 12mm, and the Sigma is the only way you'll get it. And you can't fault them for the low-quality resolution figures; it's extremely challenging to make a UWA lens of that sort of focal length. And to make it a zoom, too? Eeek. Either way, I wouldn't consider the 12-24 as a general-purpose wide-angle lens. I think for day-to-day work, stuff in the 15-24 MP range is going to be more useful.
---------- Post added 05-10-16 at 05:25 PM ----------
Originally posted by pinholecam
Samyang 14/2.8 - Its good (if you get a good copy). Its stunning in fact given the price of it vs any other thing in this FL.
Yeah, this is definitely the route I'd go if I needed an extreme UWA lens. Manual-focus doesn't bother me in this case, just given the DoF you generally aim for, and the fact that your subjects are generally moving pretty slowly across the frame when you're shooting this wide.
Originally posted by pinholecam
M20/4
I downloaded the largest size of this image on Flickr and was pretty impressed with the resolution of the image. Overall, I've been disappointed with older film glass mounted on my K-3 — while the longer lenses are fun for portraiture, a lot of the glass is absolutely shitty in terms of resolution. I'm not saying the M20/4 is one such example, but the much lower-density FF sensor will definitely give these lenses a lot more breathing room.