Originally posted by Ztrejfer Well, the DA LTD 20-40 gets not so nice reviews.
To put that in perspective, here's what Lenstip says about the FA 31:
"Comparing the results of the tested lens to those achieved by such lenses as the Nikkor 1.8/35 or the Sony 1.8/35 and taking into account the difference in price, it would be difficult to describe the performance of the Pentax in positive terms."
"What can be said…reminding ourselves how such lenses as the Nikkor 1.8/35 and the Sony DT 1.8/35 performed on similar detectors, lenses which are several times cheaper to boot, the Pentax didn’t impressed us to say the least of it."
The edge resolution of the FA 31 was measured there as 43 lp/mm at f/8,
while the same testing procedure (Optyczne with the K-5) showed 40 lp/mm
at all focal lengths at f/8 with the DA 20-40.