> "Jeff Conrad" wrote: ... > o If the edge is outside the frame, there shouldn't be > any vignetting. > o If the edge is from a filter, remove the filter (or > get a thin filter that doesn't vignette). > o If the edge is from the lens barrel, close down to > f/8 or f/11, and if that doesn't eliminate the > vignetting, you're out of luck; either reduce the > shift or abandon the shot. > ...
Hi Jeff, Perhaps I should have written: "If the obstruction is right on the edge of the frame ..." So that if the edge is rendered sharp (e.g. at f/11), there is no problem, but if the edge is rendered blurry (e.g. at f/3.5), the blur could then extend into the picture area. Cheers Julian Loke P.S. Obstructions are not the only cause for dark corners: there is also the cos^4 law, as well as the effect of coatings and radial ND filters. * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
