I'm thinking about putting a power winder on my AE-1. There are a ton of them on ebay going from $15-$100. I have seen them listed as the Canon A power winder and the Canon A-2 power winder. Does anyone know the difference? Is there any? The discriptions I have read on both of them say they will shoot at 2 fps. That seems pretty slow by today's standards, but then again, they are 20+ years old. I thought I had seen some at one time that were in the 5 fps range tho. Is there anything out there for an AE-1 that is that fast?