Microfocus knob belt drive

By connecting the motor pulley directly to the microfocusing knob, we are trying to make attaching the autofocuser as seamless as possible. This method is quite unintrusive, as it does not require focuser axis knob dissasembly, attaching directly to the axis shaft via coupler, etc. In our experience, belt slipping is a non-issue due to little force required. If the belt tension is appropriate, autofocusing works like a charm. This approach also has following pros:

  • compact mounting balance-wise in comparison to shaft mounting, which protrudes away from the telescope tube.
  • driving microfocusing knob does not require a lot of force. This means that autofocuser motor can be quite small and does not require gearbox.
  • if you racked the focuser in/out and keep on moving the motor by mistake, it is not strong enough to damage any parts of the focuser shaft (motor starts skipping steps). With coupler connected to the focuser axis directly this could not be the case. Usually stronger motor or even a gearbox is involved to drive the shaft directly. This could result in damage to the gearbox, coupler or in worse case focuser itself.

List of adapters

Baader

Explore Scientific

GSO

GSO 2" - version 1

B87MXL, 2x M3 - 20mm ORDER

JMI

MoonLite

MoonLite CR2 DualSpeed Crayford

B100MXL, 4 x M3 - 40mm ORDER

Opticstar

Sharpstar

Sharpstar 61EDPH

B87MXL, 2x M3 - 25mm ORDER

Skywatcher

Skywatcher ED80

B87MXL, 2x M3 - 16mm ORDER

Starlight

Takahashi

TAK FSQ 106

B87MXL, 2x M4 - 50mm ORDER

TS-Optics

TS-Optics 61EDPH

B87MXL, 2x M3 - 25mm ORDER

TS-Optics 80mm Triplet 480mm

B92MXL, 2 x M3 - 20mm ORDER

William Optics

WO GT 71mm f/5.9

B92MXL, 2x M4 - 30mm ORDER

WO GT81

B93MXL ORDER

WO Star 71mm f/4.9

B92MXL, 2x M4 - 30mm ORDER

WO Zenith Star 61

B92MXL, 2x M4 - 25mm ORDER

important
For mounting any of adapters to the focuser, client is responsible for providing longer replacement bolts unless explicitly specified.

Order