Archived posting to the Leica Users Group, 1997/07/07

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Subject: Focus Shift with SFX200
From: George Huczek <ghuczek@sk.sympatico.ca>
Date: Mon, 07 Jul 1997 17:17:14 -0600
 
I want to try some Ilford SFX200 with a 50 Summilux-M on an M6, using a red
filter.
Is is necessary to compensate focusing for IR light, and if so, how do I
determine how much to shift the lens?  Anyone tried this with IR film?

- -GH