The Nikon performed best at f5.6~f8 with all three lenses tested. Naturally neither the Pentax nor the Nikon lenses (or the Zeiss) perform consistently edge to edge like the rodenstock. Image sharpness varies across the frame. You might find that if you test for center sharpness that yes, some Nikon/lens combinations are sharpest at f4-f5.6, but that is only at the center. At f8 generally the max sharpness spreads across the frame to a place much close closer to the borders. At f11 ,in some lenses, edge to edge sharpness is the most uniform it can get even though it comes at a cost of slightly less ultimate center sharpness. Even so, it is never perfectly uniform. Image quality across the frame/print is whats important. I mean, what good is too have great sharpness in one point in the center only to loose more and more the closer you get to the border. (on a landscape image). I am sure that is acceptable in some situations but in others it isn\'t.
Yes, the results might have been obvious. But one can never take anything for granted. You just never know until you use it. The price/performance relationship is not linear. Both the Nikon and the Pentax could benefit from better glass obviously. But one can only make do with what is available.
May 18, 2013 at 09:30 AM
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