Archived posting to the Leica Users Group, 2000/08/27
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 8:53 AM -0700 8/27/00, Jerald Rosenfeld wrote: > I am sure that this topic has been hit a million times. I looked in the >archives and only found sketchy information. >1. What is the procedure in focusing Infrared Film using a M6TTL. >2. IS there a problem with infrared leaks with the cloth curtain? >3. Must I forfeit and just shoot at at small apertures? >Thank you for the information in advance? I shoot IR film quite often in my M4, and it is quite easy. I don't usually shoot wide open, but if necessary, I'll still do it. With newer lenses I set the focus point approximately at the closer f/2 depth of field mark, with older (70's) lenses I set it at about the f/4 mark. This is all with the Kodak HIE film, which has sensitivity further into the IR than other readily available films. With others (Konica 750, the E-6 film and the Ilford film) I don't do any adjustment at all. Especially the more recent lenses are so well corrected, and the IR sensitivity is so limited, that refocussing rarely brings any benefits. The shutter has no light leak problems. For the Kodak HIE film I have a Leica 39mm IR filter, which is equivalent to an 89B, and otherwise I use gels cut to size behind a UV filter; mostly 89B or 87. The 25 filter doesn't do quite enough with the HIE. The main problem with IR is that you have to bracket a lot, and the film is expensive, but if you are going to use it, Leica-M's are ideal. * Henning J. Wulff /|\ Wulff Photography & Design /###\ mailto:henningw@archiphoto.com |[ ]| http://www.archiphoto.com