Christoph writes:
> The max. light fall off was measured (they called it vignetting):
> At F 3.5 it is a factor of 2.6
> at F 5.6 it is 1.7
> and at F 8 it is 1.3
Following those results, my C vignetting grade would be about 2.5X brightness
in the center vs. the corners, and my B grade would be 1.5X. Since every
lens has fall off, I'd venture to guess A (= can't see it) is around 0.5X.
Gary Reese
Las Vegas, NV
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