Exposure metering discrepancy between modesgreenspun.com : LUSENET : Canon FD : One Thread
My Canon T90 has a 1/2 stop discrepancy between spot and center weighted metering modes.
With the entire field of view on a flat and constant illumination blank wall, the spot meter reading will result in 1/2 stop more light (e.g. 1/15 @ f/4) than the center weighted reading (e.g. 1/15 @ f/4.5).
This doesn't seem right to me. Can anyone confirm/deny this as normal operation?
-- John Groezinger (firstname.lastname@example.org), July 30, 1999
I think you can't be sure the difference is exactly 1/2 stops. It might be a bit more or less but large enough (maybe 1/10 stops) to make the camera display different values. You could try by adjusting slightly (less than 1/2 stops) the light intensity.
I believe there is some adjustments for spotmeter mode but I'm not sure. I have the T90 repair manual but can't reach it right now.
I don't have T90 any more, anyone interested in service manual reprint (the one I have)? I also have focusing screens A and D, anyone interested?
-- Vesa-Pekka (email@example.com), August 04, 1999.