Archived posting to the Leica Users Group, 1997/11/04

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Subject: Focussing 70-180 APO
From: "Jorg Willems" <jorg@mindspring.com>
Date: Tue, 4 Nov 1997 22:11:33 -0500
 
I noticed that infinity is not infinity when used with the 2x APO extender.
Atlanta's skyline is over 20 miles from Stone Mountain.  The picture was
tack sharp when the distance indicator was on 300 feet.
Even when used without the extender infinity is not exactly at the
'mechanical end' of the lens.  Perhaps 1 to 2 mm from the end to be tack
sharp.

Is that something to worry?

Regards Jorg