Archived posting to the Leica Users Group, 2001/03/19
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Mike, I would be careful with the rear mounted filter on the 12/5,6. Unless you make the tube shallow enough to have the filter literally touching the rear element, you might induce vignetting. The 'rays" coming out of the rear of a 12 are coming out in a steep angle, at least the corner ones. I would try it, of course, but I would not be surprised if you get degradation in the extreme corners. A better solution would be to get the 77mm filterholder from Voigtlander and go and talk to your local Movie Supply House. They can provide either Roscoe or other makes of filters in just about any spectral sensitivity. All you have to do is to cut the gel to an appropriate size and stick it in the 77mm filterholder. You could even cut a small slot in the gel to match the "see-through" slot in the filterholder.If you could find a defunct 77 filter and remove the glass, you could use the filter-ring as a template for cutting the filtergel and to hold the gel in place in the holder. I have a fetish for not using any filters at the back of a lens, unless the lens is designed for it. Rear elements are critical, any damage there shows up as a very distinctive mark on the neg. In any case, it could be an interesting image with the 12/5,6 and IR film. Talk about wide-open spaces glowing and the black sky! If it works, please post some images. Good luck, Tom A