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Forum: Pentax Full Frame
08-03-2016, 10:43 PM
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Some of the old UWA primes were pretty good, at least in the center. Very few of the UWA zooms from the film era were good - center or corner, even stopped down. I say this as someone who likes many old lenses that perform nicely on digital. Wider than 24mm on FF was a real design challenge back in the previous century.
I realize that several DA lenses perform quite well on FF, but none of the UWA lenses designed for crop are good on FF (unless you are using crop mode setting - which kind of defeats the purpose of what Timd in asking).
A fantastic amount the R&D went into the crop UWA zooms that came out as the dSLR era emerged. Not so much has happened on the FF front more recently. It is clear that the Tamron/Pentax 15-30 will be very good, but that's a far cry from 12mm and it will be costly and heavy. For the K-mount system, you could go with one of the various third-party manual focus prime UWA lenses (typically sourced from Samyang).
As for something similar to the very fine crop Sigma 8-16 in FF K-mount the Sigma 12-24 is your only really comparable option. The lens can be quite good, or very bad depending on the sample (I've had both - obviously returning the bad one which I hope got fixed before going out in that final refurb liquidation sale). So, the 12-24 is a good option, as long as you have it set up with the ability to return a bad sample.
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