Description
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.
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) |
The OPTEC-4300 12.5mm Extension Ring provides approximately 1/2-inch of extension for any OPTEC-4300 telescope adapter.
Compatibility
- Any OPTEC-4300 telescope adapter.
- Gemini Focusing Rotator.
- TCF-Lynx3 3-inch Focuser.
The OPTEC-4300 12.5mm Extension Ring provides approximately 1/2-inch of extension for any OPTEC-4300 telescope adapter.