On Sun, 06 Oct 2002 20:51:34 GMT, "Zuiko" wrote:

>I'm wondering if using TTL with a grey card is better than incident meters.
>When you set a camera to f2.8 and 1/125, the actual exposure will be
>different with different lenses because some lenses have more light loss
>than others. That's why movie lenses use T-stops instead of F-stops. So...
>are we just wasting our money with incident meters?

Lenses rarely vary much from each other in transmission,
making non-TTL metering quite practical (once everything
is calibrated to give proper film exposure). BTW, TTL
metering often depends on the accuracy of aperture and
shutter speed analogues, and on the characteristics of
the viewing screen used, and on how much light enters
the eyepiece during metering - so TTL metering does not
guarantee accuracy... (and, contrary to popular opinion,
TTL metering does not properly account for filter colors).