"Elliott, Rolland" wrote: > > I know about the film transport problems with many EOS cameras and this is > not what I'm talking about. > > Canon's literature clearly shows an exploded IS mechanism and one of the > components is labeled "IRLED" which stands for infrared light emitting > diode. It is in the EOS1v, EOS3, or EOS L series lens publication, don't > remember which. > > What I'm really after is someone who has experience using these IS lenses > with Kodak IR film, not theoretical disertations. I do appreciate any > responses though. > > While we're on the subject, anyone know which Canon lenses are corrected > into the infrared focusing range? Canon's brochures say that any "L" series > lens that lacks an infrared focusing correction mark is corrected for IR > light transmission. I have a 600mm f/4 EF L lens that doesn't show an IR > correction mark, so I'm assuming I won't need to correct the IR focus. Can > anyone back me up with field experience? > > Peace, Rolland > > - --- "Elliott, Rolland" <[EMAIL PROTECTED]> wrote: > > Someone told me that you shouldn't use IS lenses > > with infrared film because > > the Image Stabilization electronics use infrared > > LED's (light emitting > > diodes) that cause flare and wierd exposure problems > > with IR films. Any > > truth to this? > > IS does not cause any kind of problems with infrared > film. IS does not emit any kind of light. What your > source might have been refering to is the sprocket > counter for film advance. Except for the top cameras > (EOS 1n, 1v, etc) and maybe some older ones (620?) > this is implemented with an LED. This one can fog (by > your source interpreted as flare) the film to a > certain degree which depends on the camera model. But > then again this does not cause any exposure problem. > The exposure problem is probably a problem of the film > itself. Parts of the light (IR-part) you cannot see > which can cause an exposure problem. Well it isn't in the "L EF Lenses" literature, there are half schematics with no reference to "IRLED." I don't remember such from the 1v lit, either, but could be mistaken. I'm not sure what an IRLED would do for IS. But wouldn't it emit outward, rather than inward towards the film. What possible function would it have involving TTL or distance to film plane? The 1n manual lists the 200mm f1.8L., 300mm f2.8L, 500mm f4.5L and 600 mm f4L, all USM, but this was previous to IS, so I don't know if anything has changed. My wife has used the 28-135 IS USM with no apparent effect. Skip -- Shadowcatcher Imagery http://www.shadowcatcherimagery.com * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
