OPTEC Gemini 96 Focusing Rotator
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- Dual OPTEC-4300 interfaces for broad telescope and camera compatibility.
- Large 3.75 in clear aperture helps minimize vignetting.
- Compatible with DSI spacers adjustable in 0.25 in increments for precise imaging train spacing.
- Includes OPTEC-4300 to DSI adapter for imaging train expansion.
- Compatible with AG Optical, Celestron, Meade, PlaneWave, and Takahashi systems.
OPTEC Gemini Focusing Camera Rotator
The Optec Gemini combines precision focusing and camera rotation into one compact, heavy-duty unit designed specifically for astrophotography. Instead of adding a separate rotator to the end of a focuser, Gemini was engineered from the ground up with a rotating drawtube design that delivers greater strength, rigidity, and improved support for heavy imaging payloads up to 10 kg (22 lb). With four lead screws, four linear bearings, and a robust X-cage bearing system using large 6 mm chrome ball bearings, Gemini maintains excellent stability while providing smooth 360° camera rotation and 0.5 in of precise focusing travel. Despite its capabilities, the unit remains compact at just 2.45 in thick at mid-travel.
Built for serious imaging systems, Gemini uses precision-machined MIC-6 tool plate construction to maintain flatness within 0.001 in (25 microns), helping keep large cameras and accessories aligned. A high-torque stepper motor and premium timing belt drive deliver smooth, accurate movement, while the included remote temperature probe enables automatic temperature compensation to maintain sharp focus as conditions change. Gemini Commander software helps calculate your telescope’s temperature coefficient for hands-free focus adjustments throughout the night. Finished with a sleek carbon fiber wrap and dual RJ45 connections to the Gemini Control Hub, the Gemini is a premium all-in-one solution for demanding imaging setups.
Compatibility
Universal OPTEC-4300 Interface:
Identical OPTEC-4300 mechanical connections on both telescope and camera sides for broad compatibility
Secure Heavy-Duty Mounting:
Recessed oval-point setscrews create three-point contact with the OPTEC-4300 dovetail for a rigid connection
Camera-Side Adapter Included:
Includes #19830 OPTEC-4300 to DSI threaded adapter for connecting Optec DSI 3.5 High Performance spacers
Confirmed Telescope Support:
AG Optical iDK
Celestron
Ceravolo Optical Systems Astrographs
Meade 16-inch class SCT
PlaneWave Secure-Fit
Takahashi telescopes
Custom Adapters Available:
Additional interface adapters available through PreciseParts
Specifications:
Specifications for Gemini and Controller
- Clear Aperture: 3.75 in (95mm)
- Back-Focus Usage: 2.2 to 2.7 in (55.9 to 68.6 mm)
- Focuser Travel: 0.5 in (12.7 mm)
- Focuser Resolution: 0.11 microns per step
- Rotator Resolution: 600 steps per degree
- Minimum Overall Thickness: 2.2" (55.9mm) [Full IN position]
- Dimensions: 9.4 x 7.4 in(239 x 187 mm)
- Weight: 6 lb. 6 oz. (2.9 kg)
Gemini Controller Hub Specifications:
- Length: 5.1 in (130 mm)
- Width: 3.2 in (81 mm)
- Height: 1.0 in (27 mm)
- Weight: 10 oz (285 g)
- Mounting Holes: Four 4-40 x 1/8 in depth (reverse side)
- Case Material: 6061 aluminum, anodized black.
Gemini Hub Port Connections:
- Focuser: RJ45 socket for standard Cat-5e/Cat-6 cable to Focuser port
- Rotator: RJ45 socket for standard Cat-5e/Cat-6 cable to Rotator port
- Power: 12VDC input, 2.5 x 5.5mm plug, center pin positive
- Network: Standard RJ45 Ethernet socket
- Hand Controller: RJ22 socket for standard telephone handset cord
- Serial: RJ12 socket for Optec USB/Serial cable
- Wireless: 802.11 WiFi option
Other Information
- Country of Manufacture: United States
OPTEC Gemini Focusing Camera Rotator
The Optec Gemini combines precision focusing and camera rotation into one compact, heavy-duty unit designed specifically for astrophotography. Instead of adding a separate rotator to the end of a focuser, Gemini was engineered from the ground up with a rotating drawtube design that delivers greater strength, rigidity, and improved support for heavy imaging payloads up to 10 kg (22 lb). With four lead screws, four linear bearings, and a robust X-cage bearing system using large 6 mm chrome ball bearings, Gemini maintains excellent stability while providing smooth 360° camera rotation and 0.5 in of precise focusing travel. Despite its capabilities, the unit remains compact at just 2.45 in thick at mid-travel.
Built for serious imaging systems, Gemini uses precision-machined MIC-6 tool plate construction to maintain flatness within 0.001 in (25 microns), helping keep large cameras and accessories aligned. A high-torque stepper motor and premium timing belt drive deliver smooth, accurate movement, while the included remote temperature probe enables automatic temperature compensation to maintain sharp focus as conditions change. Gemini Commander software helps calculate your telescope’s temperature coefficient for hands-free focus adjustments throughout the night. Finished with a sleek carbon fiber wrap and dual RJ45 connections to the Gemini Control Hub, the Gemini is a premium all-in-one solution for demanding imaging setups.
Compatibility
Universal OPTEC-4300 Interface:
Identical OPTEC-4300 mechanical connections on both telescope and camera sides for broad compatibility
Secure Heavy-Duty Mounting:
Recessed oval-point setscrews create three-point contact with the OPTEC-4300 dovetail for a rigid connection
Camera-Side Adapter Included:
Includes #19830 OPTEC-4300 to DSI threaded adapter for connecting Optec DSI 3.5 High Performance spacers
Confirmed Telescope Support:
AG Optical iDK
Celestron
Ceravolo Optical Systems Astrographs
Meade 16-inch class SCT
PlaneWave Secure-Fit
Takahashi telescopes
Custom Adapters Available:
Additional interface adapters available through PreciseParts
Specifications:
Specifications for Gemini and Controller
- Clear Aperture: 3.75 in (95mm)
- Back-Focus Usage: 2.2 to 2.7 in (55.9 to 68.6 mm)
- Focuser Travel: 0.5 in (12.7 mm)
- Focuser Resolution: 0.11 microns per step
- Rotator Resolution: 600 steps per degree
- Minimum Overall Thickness: 2.2" (55.9mm) [Full IN position]
- Dimensions: 9.4 x 7.4 in(239 x 187 mm)
- Weight: 6 lb. 6 oz. (2.9 kg)
Gemini Controller Hub Specifications:
- Length: 5.1 in (130 mm)
- Width: 3.2 in (81 mm)
- Height: 1.0 in (27 mm)
- Weight: 10 oz (285 g)
- Mounting Holes: Four 4-40 x 1/8 in depth (reverse side)
- Case Material: 6061 aluminum, anodized black.
Gemini Hub Port Connections:
- Focuser: RJ45 socket for standard Cat-5e/Cat-6 cable to Focuser port
- Rotator: RJ45 socket for standard Cat-5e/Cat-6 cable to Rotator port
- Power: 12VDC input, 2.5 x 5.5mm plug, center pin positive
- Network: Standard RJ45 Ethernet socket
- Hand Controller: RJ22 socket for standard telephone handset cord
- Serial: RJ12 socket for Optec USB/Serial cable
- Wireless: 802.11 WiFi option
- 1x #19750 Gemini 96 Focusing Rotator
- 1x Gemini Controller
- 1x #19752 Gemini Hand Controller
- 1x Optec USB/Serial communications cable, 6-ft. length
- 2x CAT-5e/CAT-6 Ethernet cable, 6-ft. length
- 1x 12VDC 1.25A power supply - 110-240VAC input
- 1x UL/CSA compliant wall plug cord
- 1x #19830 OPTEC-4300 to DSI
- 1x Pelican type case
- Dual OPTEC-4300 interfaces for broad telescope and camera compatibility.
- Large 3.75 in clear aperture helps minimize vignetting.
- Compatible with DSI spacers adjustable in 0.25 in increments for precise imaging train spacing.
- Includes OPTEC-4300 to DSI adapter for imaging train expansion.
- Compatible with AG Optical, Celestron, Meade, PlaneWave, and Takahashi systems.
OPTEC Gemini Focusing Camera Rotator
The Optec Gemini combines precision focusing and camera rotation into one compact, heavy-duty unit designed specifically for astrophotography. Instead of adding a separate rotator to the end of a focuser, Gemini was engineered from the ground up with a rotating drawtube design that delivers greater strength, rigidity, and improved support for heavy imaging payloads up to 10 kg (22 lb). With four lead screws, four linear bearings, and a robust X-cage bearing system using large 6 mm chrome ball bearings, Gemini maintains excellent stability while providing smooth 360° camera rotation and 0.5 in of precise focusing travel. Despite its capabilities, the unit remains compact at just 2.45 in thick at mid-travel.
Built for serious imaging systems, Gemini uses precision-machined MIC-6 tool plate construction to maintain flatness within 0.001 in (25 microns), helping keep large cameras and accessories aligned. A high-torque stepper motor and premium timing belt drive deliver smooth, accurate movement, while the included remote temperature probe enables automatic temperature compensation to maintain sharp focus as conditions change. Gemini Commander software helps calculate your telescope’s temperature coefficient for hands-free focus adjustments throughout the night. Finished with a sleek carbon fiber wrap and dual RJ45 connections to the Gemini Control Hub, the Gemini is a premium all-in-one solution for demanding imaging setups.
Compatibility
Universal OPTEC-4300 Interface:
Identical OPTEC-4300 mechanical connections on both telescope and camera sides for broad compatibility
Secure Heavy-Duty Mounting:
Recessed oval-point setscrews create three-point contact with the OPTEC-4300 dovetail for a rigid connection
Camera-Side Adapter Included:
Includes #19830 OPTEC-4300 to DSI threaded adapter for connecting Optec DSI 3.5 High Performance spacers
Confirmed Telescope Support:
AG Optical iDK
Celestron
Ceravolo Optical Systems Astrographs
Meade 16-inch class SCT
PlaneWave Secure-Fit
Takahashi telescopes
Custom Adapters Available:
Additional interface adapters available through PreciseParts
Specifications:
Specifications for Gemini and Controller
- Clear Aperture: 3.75 in (95mm)
- Back-Focus Usage: 2.2 to 2.7 in (55.9 to 68.6 mm)
- Focuser Travel: 0.5 in (12.7 mm)
- Focuser Resolution: 0.11 microns per step
- Rotator Resolution: 600 steps per degree
- Minimum Overall Thickness: 2.2" (55.9mm) [Full IN position]
- Dimensions: 9.4 x 7.4 in(239 x 187 mm)
- Weight: 6 lb. 6 oz. (2.9 kg)
Gemini Controller Hub Specifications:
- Length: 5.1 in (130 mm)
- Width: 3.2 in (81 mm)
- Height: 1.0 in (27 mm)
- Weight: 10 oz (285 g)
- Mounting Holes: Four 4-40 x 1/8 in depth (reverse side)
- Case Material: 6061 aluminum, anodized black.
Gemini Hub Port Connections:
- Focuser: RJ45 socket for standard Cat-5e/Cat-6 cable to Focuser port
- Rotator: RJ45 socket for standard Cat-5e/Cat-6 cable to Rotator port
- Power: 12VDC input, 2.5 x 5.5mm plug, center pin positive
- Network: Standard RJ45 Ethernet socket
- Hand Controller: RJ22 socket for standard telephone handset cord
- Serial: RJ12 socket for Optec USB/Serial cable
- Wireless: 802.11 WiFi option
Other Information
- Country of Manufacture: United States
- 1x #19750 Gemini 96 Focusing Rotator
- 1x Gemini Controller
- 1x #19752 Gemini Hand Controller
- 1x Optec USB/Serial communications cable, 6-ft. length
- 2x CAT-5e/CAT-6 Ethernet cable, 6-ft. length
- 1x 12VDC 1.25A power supply - 110-240VAC input
- 1x UL/CSA compliant wall plug cord
- 1x #19830 OPTEC-4300 to DSI
- 1x Pelican type case
OPTEC Gemini 96 Focusing Rotator