Archived posting to the Leica Users Group, 2008/03/18

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Subject: [Leica] Canon DSLR R lens use
From: leicar at (Aram Langhans)
Date: Tue Mar 18 15:11:27 2008
References: <>

Yep there are exposure problems.  I have 6 Leica lenses and all give the 
correct exposure on my Canon XTi at full aperature, but when I stop the lens 
down, they all tend to over-expose.  The more I stop down, the more 
over-exposure I get.  I see this in both manual mode and with AE mode.  It 
does not matter if the lens is 2, 2.8 or 4 wide open.  they all give the 
correct exposure wide open.
I have tried them on my friends 20D with the same results.  David Young 
reports the same thing with is Olympus E3 and I think with his Canon 40D 
before that.  So, there is someting going on that needs to be compensated 
for.  The problem is that it is not a simple -.3 setting or something 
because the difference increases the more you stop down.  That is why I only 
use my Leica lenses on my Canon for shots that I can take the time and view 
and make changes when needed.
The focus confirmation part works out quite well.  And the 24mm makes some 
quite nice photos on the Canon.
> Date: Tue, 18 Mar 2008 05:25:55 +0000> From:> Subject: 
> [Leica] Canon DSLR R lens use> To: Leica Users Group 
> <>> Message-ID:> 
> <>>
>  > > Well, I made the plunge and got a Canon 20D used and ordered a R 
> adapter from Stephan Gandy, which should arrive tomorrow, Tuesday. I 
> remember some discussion on exposure problems with some of the Canon 
> Digitals with R lenses. Is there anything I need to set special on the 
> 20D? Or just put in Aperture Priority and start shooting? I checked the 
> archives but did not see anything. This is a stop gap while I wait to see 
> what if anything shows up at Photokina in the form of a R10. Also how big 
> of a CF card can be used with the 20D?> > Thanks for any help,> Gene> 

Replies: Reply from red735i at (Frank Filippone) ([Leica] Canon DSLR R lens use)