Quote:
Originally Posted by Bo_Lorentzen
Sandy,
For what its worth, the 75lux seem to show less corner softness. Though I have only been playing with it so far, no actual test targets. the big difference is that the exit lens on the 75mm is much further removed from the sensor causing the light to hit the sensor at a more 90deg angle. or coming straight in so to speak.. Im guessing the difference between straight in and spreading out from the wide-angle M lenses is also the key to the corner softness.
Thank you Sean, glad you like it.
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For reference, that test was done at F/4.0 at about nine feet focus distance. If you do similar tests make sure you're vertically and horizontally square to the board (wall, etc.) and bracket the focus to be sure you're hitting peak res. on center. Tiny changes in the focus ring will vary the resolution. If the focus bracketing process is sending you over the edge in boredom it is probably the right amount.
Cheers,
Sean