[Leica] Canon DSLR R lens use

[leicar at q.com (Aram Langhans)]

Gene.  
 
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.
 
 
 
Aram
 
 
> Date: Tue, 18 Mar 2008 05:25:55 +0000> From: grduprey@mchsi.com> Subject: 
> [Leica] Canon DSLR R lens use> To: Leica Users Group 
> <lug@leica-users.org>> Message-ID:> 
> <031820080525.28286.47DF52630003E9B300006E7E219792474103010CD2079C080C03BF970A9D9F9A0B9D09@mchsi.com>>
>  > > 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>