#19829 - OPTEC-4300 Extension Adapter, 12.5mm length.
#19829 - OPTEC-4300 Extension Ring, 12.5mm.
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.
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) |
- Any OPTEC-4300 telescope adapter.
- Gemini Focusing Rotator.
- TCF-Lynx3 3-inch Focuser.
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Shipping Details
- Variant: Default Title
- SKU: 19829
- Weight: 1.0 lb
- Package Dimensions : 6 X 6 X 1
- Harmonized Code: 9005.80
- Product Type: Adapter
- Brand: Optec, Inc.
The OPTEC-4300 12.5mm Extension Ring provides approximately 1/2-inch of extension for any OPTEC-4300 telescope adapter.