PaulS:
Typically, stepper motors step 1.8 degrees per step, for a total of 200 steps per revolution. Using 1/2 stepping, that is already under 1 degree per step. Gearing should let you get down to the 0.1 degree per step range, or lower. Gearing and micro-stepping could let you take pictures in 5000+ unique positions per revolution.
Yes, thats the ideal situation my steppers however are at 7.5 degrees per step (48 steps per rev)
I can gear it down considerably with the 17 tooth gear. but gearing it to .1 degree would take up a lot of room!