High power focuser motor with 1:120 reduction

229.00  incl. Vat

High-resolution high torque Robofocus compatible focuser motor with built-in 1:120 reduction. Metal gearbox. Cable included.

Select DB9 cable for AstroLink 4 mini S and RJ cable for AstroLink 4 mini USB.


Unipolar focusing stepper motor 12V with built-in 1:120 reduction gearbox that gives resolution 5760 steps per revolution that correspond to about 3 micrometers per step at standard Crayford focuser. This resolution is enough to set focus in instruments with focal ratio f/3 and slower. The motor is equipped with RJ 6 pin socket and the cable ended with a DB9 or RJ plug. This is compatible with the Robofocus standard, which can be powered by many different controllers – AstroLink, AstroHub, Moonlite, USB Focus, and many others. Motor torque is enough to work with medium and large Crayford focusers and R&P focusers (up to 3″) with load up to 4-5kg (like a monochromatic camera with filter wheel and OAG). Gears are all metal.

To rotate the microfocuser shaft version with 1:10 reduction should be used.

Technical data:

  • voltage – 12V DC
  • current – 0.4A
  • resolution – 5760 steps per revolution
  • step size – about 3 micrometers for standard Crayford focuser
  • torque – 40 Ncm
  • maximum speed – 250 steps/s
  • electrical connection – RJ 6 pin socket, RJ – DB9 cable, Robofocus compatible

You can read more about focuser motor solutions at https://astrojolo.com/astrolink-4-0-mini/focusing-stepper-motor-solutions/

Additional information

Weight 0.3 kg
Focusing cable

no, 0.3m, 0.5m, 0.8m, 1m, 1.5m, 2m, 3m

Controller side cable plug



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