| The focus screen IS linear. The brightness of the screen doesn't change with light, ergo it is linear. The meter in Multi-segment metering is set in such a way as to avoid blown highlights. If you take a picture of a scene with no highlights in it, it will expose properly, but if only one segment register highlights, it will prioritize that segment to avoid blown highlights. Proof:take a flash picture with nothing that reflects the flash (like a mirror or chrome object) and your flash exposure is going to be correct. Now, take the same picture and introduce a shiny object somewhere, and the system will try to avoid blowing that object. If you use center weighted metering, the exposure system won't try to save the highlights. |