Archived posting to the Leica Users Group, 2006/12/21
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Don't you think an effective approach would be to provide a hot mirror layer on one of the optical surfaces *inside* the lenses, at a point where the light rays incidence angles are more parallel to the axis of the optical system and where internal reflections can be optimally minimized? I think this would be an elegant solution if they can control, the internal reflections, as the lenses performance will not be altered neither on a digital nor on a film system. Leica should offer to incorporate such an internal coating on existing lenses at the time of the 6-bits conversion. At the same time, they should begin to market "digitally enhanced" lenses, with inner IR barrier coatings and 6-bits coding. Best, Ed El 22/12/2006, a las 00:25, Frank Filippone escribi?: > Hennning.... I agree that the angle of incidence will effect the > pass band..... but I am not sure how much..... and if it is within > the specs of the filter tolerance itself.... I don't know. > > But we seem to agree that the filter mounted in front of the lens > has the same issues..... > > > Frank Filippone > red735i@earthlink.net > > > A fairly small change in the angle of incidence can negate the effect > of an interference filter. I don't want to do the calculation right > now, but I wouldn't be surprised if the differences in the Leica M > and DSLR incidence angles are enough to greatly influence the outcome. > > Hot filters in front of the lens would have a similar problem, though. > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >