Archived posting to the Leica Users Group, 2007/01/18

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Subject: [Leica] M8 - Noctilux focus shift
From: len-1 at comcast.net (Leonard Taupier)
Date: Thu Jan 18 15:05:09 2007
 
I am seeing the sharp focus point about 2" behind where I focus using  
the M8 and Noctilux. I ran a test using the focus chart at 45 degrees  
and a little over a meter away and find the focus is about 30mm  
behind where it should be. Shooting stationary objects about 10 feet  
away the focus is about 2" behind. I purchased this lens new and as a  
special order from Leica exactly 1 year ago. I have run resolution  
tests using the USAF test charts, b&w film, in a M7 at a distance of  
8 feet from the  lens. No problems. I'll run them again with the M8  
and the M7. I see this with available light and with flash. The same  
test with the M8 and 75/1.4 is dead on. The 50/1.4 Summilux Asph is  
perfect.

We may have seen a hint of this with Tina's and Brian's candle shots.  
If I shift my focus closer the way I would with IR, the photos are  
perfect. Unfortunately I don't have a 60mm hot mirror filter to see  
if that corrects it.

I'll upload the Noct and 75 focus test charts if anybody wants to see  
them.

Len