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)

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

Quantity

In Stock: 12