Archived posting to the Leica Users Group, 2001/02/21

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Subject: [Leica] focus shift due to filter?
From: "Austin Franklin" <austin@darkroom.com>
Date: Wed, 21 Feb 2001 10:19:49 -0500

A claim has been made (elsewhere) that using a UV filter will cause a 'focus
shift', which, would be more critical for a rangefinder...depending on how
shifted the focus is.

What are the facts around this claim?  I take a Hasselblad with a 110/2, and
a magnifying hood...critically focus on something ~3' away, and I don't see
a focus change with a UV filter on or off...and all my Noctilux and Summilux
images are dead on focus wide open...and I do use UV filters, and I do a LOT
of close up work...I would think I'd see it there.

Perhaps there is some focus shift, but it is certainly not significant.