Julian Loke wrote: > 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.
I think you're essentially saying the same thing that I did--increase the size of the image circle by stopping down until the edge, sharp or otherwise, is just outside the field of view. > P.S. Obstructions are not the only cause for dark > corners: there is also the cos^4 law And the cos^4 falloff on a 24 TS-E with 11 mm shift in the long direction is about 2.6 steps (assuming a 58.6 mm image circle), which often is OK for a sky but is undesirable in other situations. Since I'm not aware of a center filter (radial ND grad) made for this lens, I'm not sure that much can be done about the dark edges. > ... and radial ND filters. Aren't radial NDs used to correct for cos^4 falloff (i.e., reducing the corner darkening)? Perhaps Cokin make something that goes the opposite direction (but I'd probably know if I had one mounted ...). Jeff Conrad * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
