Wayne writes:
> The lens does have a fall off in brightness (appears like about 1 stop
> difference between the centre and the extreme corners), however this is a
> normal phenomenon for an ultra wide lens. There appears to be no
difference
> at different apertures.
I haven't measured what I'm subjectively grading as vignetting and it's
falloff in f/stops, but I don't agree that improvement isn't had upon
stopping down the 18mm f/3.5
Here are the vignetting grades I've noted:
Vignetting = C (f/3.5), B-(f/5.6), B+ (f/8), A-(f/11 and 16)
If anyone has a densiometer, I'd be pleased to have them measure four
benchmark (A,B,C,D) slides for me.
Gary Reese
Las Vegas, NV
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