Optec TCF-Leo Low-Profile Temperature Compensating Focuser - No Controller

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Optec TCF-Leo Low-Profile Temperature Compensating Focuser - No Controller

Optec engineers have developed a, low profile, yet extremely robust 3-inch focuser for telescope installations where back-focus is at a premium. With the width of a typical 1.25-inch eyepiece, the TCF-Leo provides a unique focusing solution for the Celestron EdgeHD and other telescopes with limited flange-to-focus distances. 

The unique shape of the TCF-Leo is designed to fit neatly between the lock and focus knobs of the Celestron EdgeHD C-11 telescope OTA. With a center-to-edge distance of about 2.2-inches (55 mm), the TCF-Leo works exceptionally well with Innovation Foresight's On-Axis Guider, providing clearance for large cameras and filter wheels above either of the flat edges of the TCF-Leo. Additionally, the TCF-Leo's 3600 receiver fits directly on to the large 3-inch port of the Perseus Instrument Selector for ultra-fine focus of a large format camera.

With standard Optec interfaces on both telescope and camera sides, nearly any telescope imaging system can be configured. You can contact OPT for a custom adapter to fit any telescope.

TCF-Leo Specifications:

  • Overall Thickness: 1.25-inch (31.8 mm) to 1.6-inch (40.6 mm)
  • Focuser Travel: 0.35-inch (8.9 mm) 
  • Focuser Midpoint: 1.425-inch (36.2 mm)
  • Total Step Travel: 112,000 steps
  • Step Resolution: 0.08 microns
  • Weight: 1-pound 14-ounces (0.85 kg)
  • Payload Capacity: 20-pounds (9 kg)


Port Connections:

  • Focuser 1: RJ45 socket for standard Cat-5e/Cat-6 to focuser
  • Focuser 2: Optional second stepper board for RJ45 socket
  • Power: 12V DC input =2.5 x 5.5 mm plug, center pin positive
  • Network: Standard RJ45 Ethernet socket
  • Serial: RJ12 socket for Optec USB/Serial cable (included).