Archived posting to the Leica Users Group, 2003/12/07
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Yes Leica and others made opaque IR filters but not ones that corrected the focus because that is too lens specific. The standard E39 filter fits a wide variety of lenses which would all require a different correction factor depending on the focal length and even which version of the optical design. John Collier On Dec 7, 2003, at 5:15 PM, robertmeier@usjet.net wrote: > Does anyone know if Leica ever made an infrared filter like the one > Rollei > made? The Rollei filter is distinguished for two things: it is all > but > opague, only passing the infrared wavelengths, and it is slightly > ground to > compensate for the different focus point needed for infrared light, so > no > compensation is needed on the focus setting. Since with a Rollei, > like a > Leica, you don't view through the taking lens (and the filter), the > opague > filter works all right. I would love to use such a filter on my > Summircon > 50, and I might have to tape my Rollei Bayonet II filter on to it (the > diameters are just about identical). - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html