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hi jwoody
when you say camera rotator do you mean to rotate the camera or rotate the lens for focus or aperture ring ? my main interest has been timelapse movies with steppers for moving the camera dolly a few mm then taking a pic.
you can get 17's with a gearbox which slows your rpm but improves the torque and most likely get the other size nema's with gearboxes as well if need be . my first driver board i bought didn't have micro stepping its a nice feature to have but i haven't played with micro stepping yet. size wise i think nemas start at 8,11,14,17,23.34.
17 is what i would call a nice hobby size.they seem to be a standard size for 3d printers as well from what i have seen on the net. one thing about some cheaper drivers is that they run smoothly in a narrower band than say your more pricey drivers which may or may not be ok for you.my 17's will run faster and gruntier on 24v but run on 12v as well. from what little i know the nemas i chose where happy at either 12v or 24v but the amps had to be right. still you might want to double check with your motors specs as to what they like. i know my geared 15 to 1 nema 17 with lift a canon 60d with a lens mounted on a dolly vertically no problems that should give you some indication of how much torque it has not sure what you want to do with yours hope that helps
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