2014-09-02: Based on an Arduino microcontroler, a stepper motor, and software that emulates a Robofocus protocol (project ArduinoFocus), this remote focuser achieves high precision and repeatability, with a spatial resolution of 2 microns/pulse, and no measurable backlash.
The motor is attached to the dovetail, while the belt is tensed by sliding the OTA along the rings. Hence, no noticeable vibrations are transmitted.
Video showing it in action.
