cooltouch
Member
This may be Canon's recommendation, but I consider it to be wrong-headed thinking if one is shooting slides. Ask yourself why it was, then, that Nikon decided to go with a tighter 80/20 metering pattern (a departure from their old standard 60/40 pattern) with the F3. I believe it had to do with the F3's Aperture priority mode, which the F-1 with AE Finder shares. The F-1's partial screen is Canon's version of this tight pattern found with the F3.
I've only recently acquired an F-1N, but back in my slide-shooting days, I had an F3 and, after trying the A mode with a roll of slides, doing the sort of photography I usually do, I found that every single one of them was correctly exposed. It was then I became a believer in the 80/20 pattern and no longer hesitated using the A mode when I was out and about with that camera. Canon is probably assuming print film is being used, in which case the A pattern may suffice -- but even then I'd disagree based on my own experiences with Canon's centerweighted averaging pattern in its other cameras. Underexposure tends to be a real problem with Canon's centerweighted pattern because it picks up extraneous light sources too easily, and underexposure is death for print film.
I've only recently acquired an F-1N, but back in my slide-shooting days, I had an F3 and, after trying the A mode with a roll of slides, doing the sort of photography I usually do, I found that every single one of them was correctly exposed. It was then I became a believer in the 80/20 pattern and no longer hesitated using the A mode when I was out and about with that camera. Canon is probably assuming print film is being used, in which case the A pattern may suffice -- but even then I'd disagree based on my own experiences with Canon's centerweighted averaging pattern in its other cameras. Underexposure tends to be a real problem with Canon's centerweighted pattern because it picks up extraneous light sources too easily, and underexposure is death for print film.