>I thought optical vignetting (other than causes externally by a hood or a filter) was measured by light fall-off.
optical vignetting? Hum. I don't know. I always believed "vignetting" was a term used mainly to describe something else obstructing the angle of view (as you say a lens hood, filter, or even the outer part of the lens itself). I may be wrong but I though light fall-off was the "optical" version of vignetting. The failure of the lens optics to adequately illuminate near the edges of the frame. Maybe I'm wrong. I''ve just never heard of optical vignetting. -Brendan MacRae - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
