The 4300 Extension Adapter - 25 mm Length with 12.5 mm Extension:
The Optec 4300 circular Dovetail mount is meant to be used for certain OEM version TCF 3-inch focusers, and with the Gemini Focusing Rotator. One side presents the telescope specific Dovetail or thread, and the other presents the 4.3-inch diameter Optec Dovetail mount. This is a 12.5 mm Extension for use with scope-focuser adapters, in cases where you need more space between the focuser and the scope, and the adapter is too small. With how huge the Gemini Focusing Rotator is, this is a surprisingly common issue! This particular model is the 25 mm.
This 25 mm Length Adapter with 12.5 mm of Overall Extension connections are:
- Side A: 4.301"-Female Barrel with 3 Tap-screws for fastening.
- Side B: 4.98"-Male Dovetail with Anti-Reflection Threads on the inside walls.