20mm Pentax XW Vs 21mm Pentax XL - posted in Eyepieces: ..

Sigma 10-20mm f/3.5 EX DC HSM ELD SLD Aspherical Super Wide Angle Lens for Pentax Digital SLR Cameras


Sample Images & Verdict: Tweet: ..

Gianfranco Irlanda - I do not use it very often due to its aperture (I tend to prefer something faster) but I think it is a good lens. The sharpness is great in the center, but it tends to be rather soft towards the corners when wide open (the corners do not satisfy me much but I haven't done any serious test). It has a noticeable light fall-off @ f/4 that disappears when closed around f/8. It is a nice lens for its weight and size. I payed something like . . . quite expensive for a very used one but it was the only 20mm Pentax I'd ever put the hands on...

Here's some old reviews of the 18mm and 20mm Pentax lenses. The first one (BOA) hasn't been available online for many years. The second one (Stan Halpin) is still available online.

Pentax 20mm f/2.8 SMC P-FA Review - Imaging Resource

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