[Leica] Metering on Canon DSLR with Leica R Lens

[yzlee at starhub.net.sg (Yan Zhan Lee)]

Dear Luggers,

I've been metering on my 20D and Leica R lens(using Aperture Priority) 
on all modes: Evaluative, Partial, Centerweighted Averaging with mix 
results.  Most of the time, regardless of mode, I have to do some manual 
adjustments, otherwise, the pictures appear dark.  Is it possible that 
with Leica lens, since the AF points are not active, the metering mode 
is not working optimally.  My research suggest I use Partial which is 
like semi-spot with center 9% being metered.  But sometime it doesn't 
really read the light correctly.  Whats the "best" mode to use? 

Pls share your experience here.

Many Thanks
Lee