[Leica] 28mm Summicron + M8 on Auto = Overexposure?

[Frank.Dernie at btinternet.com (Frank Dernie)]

The Leica meter pattern is the crudest aspect of the camera. It  
doesn't know which lens is in place, and that is why the metering  
varies with lens :-) , wider angle with wide angle, towards spot with  
telephoto. It is a tribute to exposure latitude that lets it work as  
well as it does. Basically, the light coming through the lens is  
reflected around inside the camera and picked up by a photocell in  
front of the shutter, the vast bulk of the light to be measured has  
been reflected off the bright part of the shutter curtain, the other  
part of the "metering pattern control" is the angle of view of the  
photocell.
Frank

On 25 Oct, 2009, at 15:40, Robert D. Baron wrote:

> How does the M7 know what the focal length is?