@ raschemmel by precise, I mean the ability to repeat a camera move twice, and have those moves be identical, ala motion control.
That depends on your ability to keep track of the direction and pulses, which is more complicated than reading a shaft encoder for absolute position. Accuracy depends on how much trouble you want to go to. I would opt for the absolute position shaft encoder but they're not cheap so maybe an incremental encoder. Either way accuracy is a function of the resolution of the encoder (255/1024/2048/4096/8192/16384 etc.etc.etc..)