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[OM] Meter readings with 600mm telephoto

Subject: [OM] Meter readings with 600mm telephoto
From: "C. Hertzler" <hertzler@xxxxxxxxxx>
Date: Mon, 23 Nov 1998 18:01:53 +0100
Jan Steinman <jans@xxxxxxxxxxx> wrote:

>If it is a T-mount lens, then all bets are off for proper metering, 
>because the T-mount manufacuturer has no idea about the speed of the 
>lens it will be mounted on.

That is not necessary. The lens gives only a relative aperture 
information to the camera. In an automatic lens, it tells the 
camera: "I am open", or "I am set to x stops below open". In a T 
mount lens, it is always  in the open position. It doesn't make a 
difference, which absolute value it is.

Christoph 
        
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Christoph Hertzler                hertzler@xxxxxxxxxx
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