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

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Subject: RE: [Leica] Re: focus shift due to filter?
From: "Austin Franklin" <austin@darkroom.com>
Date: Wed, 21 Feb 2001 13:24:03 -0500

Seriously, this was a legitimate question, Jim...  Are legitimate questions
not acceptable now?

Who's criminny anyway?  My spell checker keeps trying to change it to
acrimony...

> Jeez Austin. For criminny sake!!!
>
> Jim
>
>
> At 10:19 AM 2/21/01 -0500, Austin Franklin wrote:
> >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.
>