Archived posting to the Leica Users Group, 2001/08/05

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Subject: RE: [Leica] Yet more lens tests
From: Paul Chefurka <>
Date: Sun, 5 Aug 2001 15:57:10 -0700

The Cosina 90 is nowhere near as bad as these tests indicate - I'm not sure what's going on there, but it could easily be a focusing problem.  It will take some more wotk to unravel these mysteries.  The 50/1.8 Nikkor did about as well this time as last time, so I'm satisfied that it's as bad as it seems :-)  And that 85/2.0 is pretty dang good, isn't it?  I can now go toe to toe with its detractors, with at least a bit of evidence to back me up.

I haven't shot much wide open with the 28 Summicron yet, so I'm not sure what's going on there - both f/2.0 frames looked similar, so I don't think I screwed the pooch when I focussed it (I focussed independently for each shot).  We shall see.  It does point out how little DOF wide angle lenses have when they're opened right up.


- -----Original Message-----
From: Dan States []
Sent: Sunday, August 05, 2001 5:53 PM
Subject: Re: [Leica] Yet more lens tests

As you indicated there is a suprising amount of focus shift as the lenses 
are stopped down.  The Summicron 28 seems to be focused somewhere just ahead 
of the frame in the F2 shot, but dead on in the others.  The Summicron 50 
also shows some shift.

Does your test result with the Cosina match your other experiences with it?  
It seems awful.  Likewise the 50 1.8 Nikon.  The 85 F2 is suprisingly good.

Best wishes
Dan States