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09-21-2011, 10:01 AM   #31
Lowell Goudge's Avatar

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it's interesting, but I have been playing with comparison of all the different 14mm options I own at present.

what this includes are

sigma APO 10-20F4-5.6 EX DC
Vivitar (aka samyng) 13F2.8
various 28mm lenses with a .45 wide angle adaptor.

here's what I found so far.

-at 14mm the sigma acutally suffers very slightly from pincushion distortion
-the samyang has measureable barrel distortion but is correctible in any good editor.
-any 28mm with a wide angle adaptor suffers terribly from lateral CA, (i have not yet determined if it can be 100% corrected in pentax photo lab) and suffers from both mustache and barrel distortion, such that if you crop out the outer 20% of the frame you really only have a 16mm useable area, even after fixing the barrel distortion.
-neither the sigma or samyang lenses produce any real lateral CA

09-21-2011, 10:01 AM   #32
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QuoteOriginally posted by mmrempen Quote
I'd like a prime, or fixed, because the Tammy is already a zoom, and it's pretty hefty. I want something small and portable. Not fisheye or distorted, and autofocus if possible,
Why not consider the Tamron 17-50mm f/2.8? It's a zoom, but not that big for a constant f/2.8. And it's rather cheap.

Otherwise the DA 15mm or maybe even the DA 21mm fit your description the best of course.

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