The external motor controller (XMC) was designed to expand the focus capabilities of the "Ultimate Powerbox v2" (supports a 2nd focus controller) and adds focus functionality to the "Pocket Powerbox Advance".
Works with bipolar or unpolar stepper motors
Full, half, 1/4 and 1/8 step (microstepping)
Large range of supported stepper motors
Connector for environmental sensor
Protected against undervoltage, overcurrent and overtemperature
Made especially for Ultimate Powerbox v2 and Pocket Powerbox Advance
Field corrector and focal reducer for compact 70 mm and 72 mm APO or ED refractors for astrophotography, for example TS 70 mm f/6 ED or TS SD Apo 72 mm f/6