You can set position A and B easily with the controller but they are gone after you ...

Overall this is an okay product. You need to use two tripods/stands to support this slider to avoiding tilting when camera moves from one side to the other. You can set position A and B easily with the controller but they are gone after you power the thing off. Noise from the motor is loud. So it's not good for interview. The follow focus function only work well in the center part of the slider, as it gets close to the two ends, the rotation is not that smooth.

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