Archived posting to the Leica Users Group, 1997/05/14

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Subject: Re: Unscientific lens testing (somewhat off topic).
From: Bill Grimwood <>
Date: Wed, 14 May 1997 11:48:14 -0500

>[2] All three lenses, as well 500/8's by Minolta, Leica, Nikon and my
>1000/11 Celestron all focus to beyond infinty.  Does anyone where know the
>reason Mirror lenses do not have an infinity stop?

I believe this is due to temperature changes, the mirror can change size
due to contraction or expansion and this will cause the focus to shift.