Archived posting to the Leica Users Group, 1997/07/07
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 08:23 PM 07/07/97 -0700, you wrote: >Hi George. I haven't used the Ilford SFX stuff, but I have used Kodak's >infrared in my Leica Ms. The Ilford captures a smaller amount of the >infrared spectrum than does the Kodak, so I would guess the focus >adjustment would be less, or certainly no more. Anyhow, just focus on >your subject, then move the focus a tad closer -- that is, move the lens >outward. On the 50mm Summicron, moving the focus point to about the f/4 >or f/5.6 mark on your depth of field scale should do it. I presume the >Summilux is similarly marked. > >It sounds complicated but in practice it's not much of a bother. It's >usually a good idea to stop the lens down to f/8, f/11 or f/16, as the >depth of field will take care of the focus imprecision and give you a >nice fudge factor. As the best infrared effects take place in bright sun, >that should be easy to do. I've had good success with the Kodak infrared >and a red Wratten 25 filter. It's a bit harder to handle than the Ilford, >though. > Thanks for the info. I suppose that with TTL metering it will be pretty much hit-or-miss as far as correct exposure is concerned. Bracketing may not be practical with the subject matter I am looking for. I'm used to those red dots on non-Leica lenses, which show how much to shift the lens at infinity. It should be interesting to see what happens. I'll try to see how much a slight shift of the lens throws out the rangefinder image, so I can guestimate the focus on the fly and use a small aperture to allow the extra Depth of Field to bail me out as needed. - -GH