I'm getting back into photography after a 20 year hiatus. Cut my teeth with the K-1000. I'm getting into Equine Sports Photography, trying my hand at it at least. I work as stablemaster to my family ranch, and I get to see a lot of horses doing pretty amazing things... This is the set I'm getting: Sigma SA-7 set Mainly I'm hoping you folks will tell me that I'm good for speedy focus and action. Looking at all the features on this, in 1983 this would have cost $2,000-$3,000 (and some of the stuff wouldn't be available at all). Also, the lenses automatically set F-stop and Shutter Speed. Is it normal for auto lenses to be able to lock the F-Stop? The reason is I'd like to lock my depth of field to be very shallow. I'll deal if I can't, but it would be nice... And, too, is anyone around here doing sports photogaphy at all? Little Leage or whatever?