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R&P Focuser Tension Adjustment

Aug 6, 2025 by WO Team

William Optics focusers are typically smooth and ready to use without any adjustment. For larger telescopes, tightening the Quick Tension Adjustment Knob can help prevent tube slippage. Other than this, we recommend not touching any screws on the focuser. If adjustment is necessary, please consult a qualified technician.
 
There’s two side to build R&P focuser tension:

BOTTOM / Rack & Pinion Gear

 invert
  • Quick tension adjustment knob
  • Smoothness adjustment - Pull in (3mm Hex)
  • Smoothness adjustment - Push out (2mm Hex)
  • Top cover screw Can be removed to attach the electronic devices such as EAF (refer to Installing EAF)
  • Please Don’t Touch

TOP / Focuser Draw Tube

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  • Focuser Draw Tube Tension Screw - Please Don’t Touch
  • Guider/Finder bracket mounting screws (2.5mm Hex)
 
Notice
  • When operating the telescope with a motorized focuser, do not overtighten the focuser tension. Excessive tension may damage the focuser mechanism.
  • Only adjust focuser smoothness if necessary. Incorrect adjustments may affect focusing accuracy or cause mechanical issues.
  • Make small and slow adjustments. Do not turn anything too much at once.
 

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