Optec Gemini 3.75" Low Profile Rotofocuser with adapters for Officina Stellare Pro RC, RiDK and RiFAST telescopes.
Optec engineers have developed a completely new concept for combining telescope focus and camera rotation functions into a single robust, yet compact package. Rather than simply adding a rotator onto the end of a focuser drawtube, Gemini was designed from inception with a rotating drawtube providing superior strength and rigidity for heavy camera payloads.
Featuring four lead-screws and four linear bearings, Gemini can easily handle 10kg (22lbs) payload packages without flexure. Full 360-degree rotation is a built-in function of the Gemini with a full 1/2" of linear travel. At the center of travel, Gemini measures a mere 2.45" in thickness.
To maintain a flat, rigid base for heavy camera packages, Gemini's shell consists of two parallel plates machined from MIC-6 tool plate providing flatness within 0.001" (25 microns). Seven precise stand-off spacers maintain the 2.2" separation of these plates. The rotating drawtube is moved linearly with 1/2" of total travel using a premium timing belt driven by a high torque stepper motor.
The entire package is accented with a beautiful carbon fiber wrap. Dual RJ45 connectors provide connection to the Gemini Control hub. The independent rotating drawtube is supported by a custom X-cage bearing system supported by large, 6mm chrome ball bearings.
||95 mm (3.75")
||Focuser - 0.11 μ per step, Rotator - 600 steps per degree|
||55.9 mm - 68.6 mm (2.2" - 2.7")|
||10 kg (22lbs)
||12.7 mm (0.5")|
||239 mm x 187 mm x 55.9 mm