In a message dated 11/17/2005 6:50:24 AM Pacific Standard Time, [EMAIL PROTECTED] writes: Because, in many cameras of this type, the metering cell is in the prism. It will be calibrated for the difference in light falling on the film (x) and the light passing through the extra bits like focussing screens and other bits of glass/plastic (x-)
If you change one of those pieces, x remains the same but x- will possibly be different. Therefore the calibration will not work and you will get a different exposure value. It will usually be constant, so you can dial in exposure compensation to, er, compensate. m ========= Aha! Very clear explanation, thanks. They mention using exposure compensation. Marnie aka Doe
