I believe a lens will vignette at wide apertures first - large format
cameras always specify what aperture is used to cover a given image
circle.
-jeff
----- Original Message ----- > I don't have a light box but maybe
stopping down the lens to f22 and
> looking through the viewfinder as something bright e.g. a lightbulb
> might give me an indication if the 28mm hood is going to cause
> vignetting? I could of course take a few pictures at f22 and see how
> they come out. Maybe that's what I'll do. I'll try a 24 mm f2.8 (49mm
> screw in) hood as well.
>
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