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.
Compatible With
- Any OPTEC-4300 telescope adapter.
- Gemini Focusing Rotator.
- TCF-Lynx3 3-inch Focuser.
Specifications
- 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)
- Drawing
