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Hi Leon,
If you don`t want to bother with flats or a light box just stop your lense down to about f/4. I don`t bother with flats with my 200mm lense and I push the processing real hard and I don`t really notice any vignetting at f/3.5-f/4 but there is some wide open.
Nearly all fast lenses will suffer from vignetting wide open and the shorter focal length ones are even worse. A stop or to closed down will reduce it significantly.
cheers Gary
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