Katz Eye has replacement focusing screens for semipro Canon cameras, but they do affect the light meter in some situations. I am rather fond of using my spot meter, but am annoyed by the effects of not being able to properly gauge my focus with wide apertures. Are there any suggestions for coping with this?
I think it would be the best outcome if there were some way to adjust the light meter in the camera, but I don't believe the camera software supports mapping the light meter readings (some situations have no change, some are positive, some negative).