OPTEC-4300 to internal 3-inch clamp to allows tight fit of Paracorr, Wynne Correctors, and other 3-inch optics for the Gemini Focusing Rotator. Adjustable placement of lens inside Gemini drawtube allows ideal spacing of corrector / flattener optics to primary mirror

• 3-inch internal clamp assembly with OPTEC-4300 dovetail,
• 9/64” ball driver,
• 5/64” hex key.