I have a Nikon F3 set up with a DA-2 action finder and 24/2.0 AIS lense. Although this is a SLR, and I have F2.0 it is seldom used. 98% of the time I keep the F-stop pegged at 5.6, meter off the back of my hand, and use the distance scale or hyper focal distance to use this rig as a point and shoot.
Fast lenses or faster lenses aren't always needed/required.
Calzone