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Forum: Pentax K-1 & K-1 II
05-24-2016, 12:36 AM
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Really cool photo — however, I don't think stitched photos are useful to post in this thread, as they greatly exaggerate the FOV and resolving capability of the optic in question. You could shoot that same photo with an FA* 85, a cheapo Quantaray zoom, or really any other lens, and it'd look the same.
You can't really show me that picture and say, "this is what the FA28 looks like"
I'd recommend people only post single-exposure pictures, just so that newer readers don't get confused, especially since so many people are used to an "APS-C mindset"
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Forum: Pentax K-1 & K-1 II
05-10-2016, 04:49 PM
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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 ----------
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 ----------
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.
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.
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