It's funny how this 7-years old thread has been revived without any apparent reason. Oh well, anyway.
Coincidentally, I also used to own a Canon A-1. Excepting the fact that it was only available in black and had some horrible plastic part here and there, it was a terrific camera, with manual, aperture priority, time priority, programmed, and stopped-down exposure meter. Wow. It's still one of the most complete ever made in this respect.
However, although I thought I had struck gold at first, I had to scale back my expectations very quickly. First I realised that shutter priority is a dangerous tool, as it drags you in dangerous zones when the light is low. It works well when light is abundant, but who really needs any artificial intelligence help when light is abundant? However, the Program mode was what really turned me off.
The way in which the Program mode was... well... "programmed" by Canon engineers is illustrated in the user's manual in form of a diagram, and with my highest surprise it was absolutely linear. For simplicity, these are the shutter/aperture couplings that it will provide with a f:1,4 lens under progressively decreasing light:
1/1000 f:16
1/500 f:11
1/250 f:8
1/125 f:5,6
1/60 f:4
1/30 f:2,8
1/15 f:2
1/8 f:1,4
1/4 f:1,4
1/2 f:1,4
.
.
.
and so on. All is quite reasonable from 1/1000th down to 1/125th. We could argue wether 1/60th at f:4 is a good choice or not, but let's say it's tolerable anyway. But, below that, and exactly when the light becomes hard to handle and one would really need a help, the Program mode makes a huge huge mess. Why should anyone want to take a picture at 1/30th f:2,8, which will be almost certainly blurred, when it could be taken it at 1/60th f:2, or even better at 1/125th f:1,4? I would *never*, under no circumstances, do that. And why should anyone want to take a 100% likely blurred picture at 1/15th f:2, when there's still room to try it at 1/30th f:1,4 and have some chance to get perhaps a decent, sharp picture with some luck?
In few words, A-1's Program mode takes wrong decisions, at least in respect to what I consider a good photography practice, and these wrong decisions are taken in a range in which some intelligent help would be most welcomed. I later resold the A-1 for various reasons, and sometimes I miss it as it was a good camera. But what I have never, really *never* missed is its Program mode!