Archived posting to the Leica Users Group, 2012/04/15

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Subject: [Leica] Possible lens adjustments
From: john at mcmaster.co.nz (John McMaster)
Date: Sun, 15 Apr 2012 21:28:37 +0000
 
Just what is possible with tweaking?

I tested my 75mm Summilux yesterday, tripod and 1.4x magnifier, at f1.4-f8 
in full stops. I am more interested in the wide open focus.

It is spot on 10m to infinity.

It back focusses greatly 3m to 8m (+10cm)

It back focusses less so <3m

Will it ever focus correctly at all distances?
Will I have to choose an aperture and distance to get optimum calibration 
and the rest all fit around that?

thanks

john
Replies: Reply from chris at chriscrawfordphoto.com (Chris Crawford) ([Leica] Possible lens adjustments)
Reply from dstella1 at ameritech.net (Dante Stella) ([Leica] Possible lens adjustments)
Reply from dstella1 at ameritech.net (Dante Stella) ([Leica] Possible lens adjustments)
Reply from red735i at earthlink.net (Frank Filippone) ([Leica] Possible lens adjustments)
Reply from hopsternew at gmail.com (Geoff Hopkinson) ([Leica] Possible lens adjustments)