[Leica] For Sale..Be ready for the big EMP

[henningw at archiphoto.com (Henning Wulff)]

At 11:26 AM -0800 2/1/08, slobodan dimitrov wrote:
>I tried 3 lenses on an M4. All produced the hot spot.
>But that was over 30 years ago. Now, I'll stick with a metal shutter.
>On the other hand, resolution is so low with IR, that any lens will do.
>s.d.
>

The Rollei and Ilford films you mentioned actually have quite high 
resolution, but then they are hardly IR sensitive, so the lens 
correction doesn't matter very much.

With HIE, the lens correction did matter quite a bit, and poorly 
corrected lenses were easily exposed in spite of the low absolute 
resolution. Besides the expected longitudinal colour error, lateral 
colour errors caused mush with many lenses, and coma was often 
terrible.

The cloth shutter in Leicas is quite IR opaque, which is easily 
tested by laying an IR loaded camera out in the sun with the lens 
removed. You'll get no more light leaks than you would with Tri-X.


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