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Optec TCF-LEO Low Profile Motor Focus

In stock
can be shipped within 1-2 days

Price includes VAT, plus delivery

Optec engineers have developed a new, 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 telescopes with limited flange-to-focus distances allowing you to add other accessories that would otherwise not be possible.  The proven Focuslynx control system is included with every TCF-Leo and can be expanded to provide control for a second focuser.  The FocusLynx system includes optional 802.11 WiFi and Hand Control accessories.

With standard Optec interfaces on both telescope and camera sides, nearly any telescope imaging system can be configured.   Specify any of the Optec 3600 telescope adapters or contact us for a custom adapter to fit any telescope.

The images above show the TCF-LEO on its own and together with some example adapters fitted.

As a full 3-inch focuser, the TCF-Leo drawtube accepts any of the Optec 3000 series adapters. Again custom adapters can be ordered.  The optional Precision Centering Adapter allows any large 2-inch diagonal or eyepiece to be added behind the focuser.  Visual users will appreciate the FocusLynx Hand Controller with fine-focus rotary knob for no-touch operation of the telescope focus.

Please note that the TCF-Leo is not supplied with a standard means to connect to your telescope or camera. It requires the addition of specific 3600/3000 series format adapters.

Basic 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
  • Camera-Side Mount:    OPTEC-3000 3-inch drawtube
  • Control System:    FocusLynx Controller (included)
  • Stepper Motor Control:    bipolar and unipolar stepper motors
  • Resolution:    16-bit controller with 65,535 step range per focuser
  • 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



  • 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 (included).
Browse these categories as well: Focusers and Rotators, Optec