I have a pan mount for a webcam that needs to be smoothly and quietly rotated. The load is small (the camera weighs 3 oz) and is supported by the axle so I do not need a lot of torque.
I was considering a small stepper like this one:
But from what I've read, steppers are inefficient and consuming power all the time. Since the camera will spend more time standing still and only move occasionally, it might make more sense to use a dc motor with an encoder. However, I have no idea how to code an arduino to move a dc motor with encoder to specific positions.