#19839 - OPTEC-4300 Extension Adapter, 25mm length.
#19839 - 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.
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Shipping Details
- Variant: Default Title
- SKU: 19839
- Weight: 1.0 lb
- Package Dimensions :
- Harmonized Code: 9005.80
- Product Type: Adapter
- Brand: Optec, Inc.
The OPTEC-4300 25mm Extension Ring provides approximately 1-inch of extension for any OPTEC-4300 telescope adapter.