The Tokina 20-35 F2.8
This one caught my eye recently.
Anyone have the "pro" 2.8 version? How well does it work on such cams like the K5?
My personal thought on older film ultra wides is they might be fine for film but not great on digital crop sensors, especially wide open. Stopped down to f/4 or 5.6 they tend to be pretty decent.
You are looking at a very normal range (20-35) and a relatively large lens with mediocre performance. Something like a Tamron 17-50mm f/2.8 or Pentax 16-50mm f/2.8 is going to be better over the shared range, go wider and more telephoto, and might not cost all that much more. If you are going to have to stop down to f/4 or 5.6 to get good performance out of it there isn't much advantage over a kit lens. If Pentax comes out with a 135 format camera, I might change my opinion
I never saw an ugly thing in my life: for let the form of an object
be what it may - light, shade, and perspective will always make it
beautiful. - John Constable (quote)