Except the light-fall-off issue at wide open.
Regards, Alan Chan http://www.pbase.com/wlachan
That's good to hear, as the SMC-F 28 f/2.8 is the same lens formula as the SMC-A version of this lens, which was a supposedly much improved design from the SMC-M version of the lens. From my experience and judging from others' comments, however, you may be even more impressed with the SMC-FA 28mm f/2.8, which incorporates an aspherical element and is one of the sharpest 28mm primes Pentax has ever made.
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