I've been reading the various threads on the FA24/2, and looking at some test results. I don't want to start another thread on this lens, but I found it fascinating that Photozone.de used MTF results on this lens to declare it somewhat disappointing in the corners compared to other similar lenses, while another tester shot USAF targets and got rather stellar results compared to the same lens.
http://www.takinami.com/yoshihiko/photo/lens_test/pentax_superwide.html Sample photos posted on the threads semm more in line with the USAF target results to my eyes.
All this reminds me of getting my copies of Pop Photo and Modern Photo 25 years ago. One used MTF for lens tests and one used USAF resolution targets. I always felt I could better visualize what the resolution targets Modern used were measuring, but who knows.
So what lens testing measure in reviews makes most sense to this group? (I would admit just grabbing it and testing is always best, but it is seldom practical in the world of internet sales).
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