OPTEC-4300 Extension Adapter, 25mm length.

$85.00

Quantity

#17839 - OPTEC-4300 Extension Ring, 25mm.

The OPTEC-4300 25mm Extension Ring provides approximately 1-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.

Inside Diameter: 3.9" (99mm)
Outside Diameter: 4.95" (126mm)

Overall Height:

1.30" (33.2mm)
Clear Aperture: 3.9" (99mm)
Weight: 8.8 oz (250 g)
Back-Focus Usage: 0.984" (25mm)

  • Any OPTEC-4300 telescope adapter.
  • Gemini Focusing Rotator.
  • TCF-Lynx3 3-inch Focuser.

    The OPTEC-4300 25mm Extension Ring provides approximately 1-inch of extension for any OPTEC-4300 telescope adapter.  

  • Package Details