Archived posting to the Leica Users Group, 2003/06/27
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Hi Austin, Thanks for confirming my basic understanding. One question, though: It doesn't make intuitive sense to me that a retrofocal WA lens designed for SLR film (assuming it is able to light a 24x36mm square of film relatively evenly) would vignette on a 24x36mm digital sensor any worse than it would on the same area of film. Can you "shed light?" (Tee hee! Sorry, couldn't resist.) Thanks, Aaron > SLR wide angle lenses (which are of retrofocal design, > > meaning they have elements designed to bend the light rays back > > into being > > mostly parallel with each other in order that the rays of interest still > > all hit the film after travelling the additional distance to accommodate > > the mirror) send all of their image to the film/sensor at a > > pretty-close-to > > perpendicular angle of incidence. Therefore they work for film > > and current > > digital sensors. Anyway, that's my understanding. > >Not quite. It's the wide angle lenses that are the problem, and they, even >for SLRs, still have vignetting problems with full frame sensors. Why most >digital SLRs don't show this problem is the sensor is in fact half the size >of 35mm film...and therefore doesn't use the light outside that region. - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html