#19829 - OPTEC-4300 Extension Adapter, 12.5mm length.


In Stock: 9

The OPTEC-4300 12.5mm Extension Ring provides approximately 1/2-inch of extension for any OPTEC-4300 telescope adapter. Ideal for telescopes where the Gemini Focusing Rotator may need to pushed out and away from the OTA to provide clearance for cooling fans or when a little extension is required to reach optimal focus.

  • Any OPTEC-4300 telescope adapter.
  • Gemini Focusing Rotator.
  • TCF-Lynx3 3-inch Focuser.
  • Inside Diameter: 3.9" (99mm)
  • Outside Diameter: 4.95" (126mm)
  • Overall Height: 0.81" (20.6mm)
  • Clear Aperture: 3.9" (99mm)
  • Weight: 5.0 oz (145 g)
  • Back-Focus Usage: 0.492" (12.5mm)