Dear Leigh,
You say: “I'm not quite sure what experience base with Bessas has prompted either of these comments. First, to "over-ride" AE you simply move the the speed dial off "A". Thereafter you either go fully manual (i.e. estimating the exposures) or you use the meter facility in the viewfinder and adjust the aperture or shutter speed according to taste.”
I was not talking about buttons or dials, but about going mentally, and then physically, lots of times, from the concept of AE to the concept of judging over a meter reading to vary it... I meant why trusting the exposure given by a blind average sensor in AE when that's just like always shooting at 0 with manual metering? And that is, having an imprecise exposure most of the times, not just a few of them... If you use negative you don't see it directly, but if you use slide film, in one roll shot under several lighting situations, few shots will be well exposed...
And you say: “Second, most Bessa users find the AE gives very good exposure control and with the under/over exposure settings on the shutter dial giving a full two stops in either direction it's the simplest thing to note any excess of light or dark in the scene and move the dial.”
If AE was really great, most pro cameras would have just that, and skip manual options... And handheld meters would have disappeared 40 years ago with the birth of AE... But reality is totally different, and shows how much a serious photographer can really trust AE... If you want to see it, go make a portrait of a subject in a white wall: you'll get a 1-2 stops underexposure... Or in a dark scene you'll get a gross overexposure... Or with backlighting situations, worse... So, what you talk about: knowing the light and setting compensation on camera... It can be used for doing a lot of shots in the same situation and place, yes, but that's not AE really: that's manual, because you see a reading and then, manually set another exposure change... And the same if you point here and there changing compensation several times: you're not having a really comfortable AE device: you're losing time, because you start thinking you won't need to worry about exposure, but that's a lie... You have no more than two options with AE: the first, is using it, trusting it, and missing lots of shots, and the other one, is taking decisions depending on the scene, and that's manual metering, and not AE...
Cheers,
Juan