TCF-Leo Low Profile Focuser (with controller)


Optec TCF-Leo Low Profile Focuser (with controller)

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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 1-1/4″ eyepiece, the TCF-Leo provides a unique focusing solution for the Celestron EdgeHD and other telescopes with limited flange-to-focus distances.

The proven FocusLynx control system operates the TCF-Leo and can be extended to provide control for a second focuser and supports the optional 802.11 WiFi and Hand Control accessories.

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 (55mm), 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.

The TCF-Leo supports several draw tube options including the Optec 3000 dovetail, a DSI 3.5″ receiver, and a 3-inch split clamp for Wynne Correctors. You can select the option that works best for your system.

Can be ordered with the controller or without if purchased previously.

Various version available:

  • Standard
  • Extended Height
  • DSI-3.5″ Threads
  • 3″ Split Clamp


TCF-Leo Specifications
  • Overall Thickness:    1.25″ (31.8mm) to 1.6″ (40.6mm)
  • Focuser Travel:    0.35″ (8.9mm)
  • Focuser Midpoint:    1.425″ (36.2mm)
  • Total Step Travel:    112,000 steps
  • Step Resolution:    0.08 microns
  • Weight:    1lb. 14 oz. (0.85 kg)
  • Payload Capacity:    20-lbs. (9 kg)
  • Telescope-side Mount:    OPTEC-3600 dovetail
  • Control System:    FocusLynx Controller (included if option selected)
Camera-Side Mount (based on selected option):
  • OPTEC-3000 3-inch drawtube (Default)
  • OPTEC-3000 3-inch drawtube (Extended Height)
  • DSI 3.5″ receiver
  • 3-inch split clamp for Wynne Correctors
FocusLynx Controller Specifications
  • Stepper Motor Control:    bipolar and unipolar stepper motors,
  • PC Connectivity:    USB/Serial, Ethernet, or optional 802.11 WiFi,
  • Hand Control:    Optional 2-button with Digital Read-Out,
  • WiFi Connection:    Optional 802.11b/g compatible,
  • Second Stepper:    Optional plug-in daughter board,
  • Input Power:    12VDC univeral power supply (110 to 230VAC input),
  • Alternative Power:    Field battery voltage (13.8VDC) with optional automotive cigarette lighter plug,
  • Software Drivers:    ASCOM local server, X2 native drivers for TheSky X
FocusLynx Port Connections:
  • Focuser 1:    RJ45 socket for standard Cat-5e/Cat-6 to focuser,
  • Focuser 2:    Optional second stepper board for RJ45 socket,
  • 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.
TCF-Leo Package Contects
  • TCF-Leo Low Profile Focuser,
  • FocusLynx Control Hub (if hub option selected),
  • Optec USB/Serial communications cable, 6-ft. length (if hub option selected),
  • CAT-5e/CAT-6 Ethernet cable, 6-ft. length (if hub option selected),
  • 12VDC 1.25A power supply – 110-240VAC input (if hub option selected),
  • UL/CSA compliant wall plug cord (if hub option selected)


Special Mounting kits available for the Takahashi Epsilons (please contact us).



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