most modern telephotos really are better than most extreme wide angle lenses. Below 28mm focal lenght almost all lenses for 35mm SLR cameras suffer from severe fall-off of resolution and contrast from the image centre to the image border. If you look at the MTF diagrams given e.g. in ColorFoto, you can easily check this. Also, I myself have tested the famous K15/f3.5 and FA24/f2 lenses, and I came to the same result: Good in the image centre but problematic at the borders....Could this be a problem with Pentax, instead of all SLR wide angles? I remember a UK magazine did some test and they said while the Pentax 15/3.5 was the most flare resistance (along with T*), Zeiss & Nikkor 15mm had better sharpest from centre to corners. The Pentax 15mm, they said, was okay from f8 up, but still not particular good against Zeiss & Nikkor. Consider the Nikkor had flare problem, Zeiss was the clear winner of the test.
regards,
Alan Chan
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