Hello all: I started back inti BW photography with a Canon A-1 bought 18 months ago. I love it still but progressed to medium format (with my Bronica), which fits what I am doing (nature shots, still life, etc.). Basically things I can set up and take my time with. Now, however, I am going to a motorcross race next weekend, and so I need to be able to snap pictures quickly. The A-1 is potentially automatic enough for that, especially if I get an auto winder. (the Bronica is pointless for action shots) But I think an auto-focus lens or two would help. Now, I know NOTHING about auto focus lenses. Can I buy them for my old A-1, or do I need a camera designed for them? To those of you who know about such things, this probably seems like a stupid question, but I am just so far down the learning curve about auto-focus that I need a primer.