Rainbow RSF Secondary Mirror Focuser
 Rainbow RSF Secondary Mirror FocuserRainbow RSF Secondary Mirror Focuser 

Rainbow RSF Secondary Mirror Focuser

£735.00✓ 2 year warranty


1x in stock shipped 1-2 working days

1 x Ex Demo Available

Rainbow RSF Secondary Mirror Focuser 2" Adaptor for 8" RC

£96.00 £84.00

About this product

Model:  rainbow_rsf_focuser

This RSF Secondary Mirror Focuser from Rainbow Robotics replaces the standard focuser on your GSO-manufactured 8" to 16" Ritchey Chretien Telescope (StellaLyra, TS, Astrotech, etc.). 

Compatible with both Solid and Truss Tube models.

It can be mounted easily without permanently modifying the telescope.

Adding the secondary mirror focussing to your RC enables you to use the heaviest imaging camera and accessories on the telescope's rear without worrying about flexure or tilt.

The RSF Focuser has a built-in Homing Sensor, so the focuser can find its mechanical origin by itself.  

A hand controller is also included for visual astronomy where no PC is required or present.


  • Type: Secondary Mirror Moving Motor Focuser
  • Motor" Stepper
  • Focusing Travel: +/- 8mm (at focal plane +/- 48mm)
  • Minimum Step Size: 0.01mm (at focal plane 0.06mm)
  • Weight: 560g
  • Material: Aluminium AL6061
  • Coating: Anodised
  • Input Power: 12v
  • Control: Hand Controller, Stand Alone PC Program, ASCOM driver
  • Compatibility: Solid or Truss Tube RC Telescope (GSO, StellaLyra, Astro-Tech, TS)

There are two optional fixing adaptors for 8" and 10" and larger scopes

What's in the box

  • Focuser body
  • Spider vane
  • Bolts for spider vane(M3)
  • Flocking material
  • Stickers
  • Cable mount
  • Power cable
  • USB cable
  • Double sided adhesive tape
  • Controller connector
  • Hand controller

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