Henry P is both right and wrong! Vignetting caused optically from within the lens (i.e as a result of the distance and angle of exit of light from the diaphragm) is lessened as the lens is stopped down.
Vignetting caused mechanically from outside the lens (e.g as a result of filter ring(s)/too lengthy a hood etc.) is increased as the lens is stopped down. The focused distance also has an effect. Hope this helps Craig Z ----- Original Message ----- From: "Chip Louie" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, October 19, 2001 12:13 AM Subject: RE: EOS Just used my EF35/2.0... (sigh) > > Hi, > > Was just wondering something. I recently suggested that someone with a EF > 28-105USM and a vignette problem try testing wide open and stopping down > until the problem went away to see if the problem was the lens or the > filter. Henry P. said that lenses that vignette will be at their best when > wide open and get worse as they are stopped down. > > This is just wrong in my experience and there was a long string of trying to > explain the whys and wherefores by many others. I just watched as it got > silly and must have missed the end of it. The recent mention of the French > magazine CD and their test results on vignette refreshed my memory and I > wondered if after all of Henry's insistence that he was correct if he ever > said he was mistaken or if everyone else just gave up? * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
