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.
Specifications
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.
Package Contents
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)
Resources
TCF-Leo installation instructions are available here.
Drawing for Default Drawtube (19740)
Drawing for Extended Drawtube (19741)
Downloads
FocusLynx download page
