TCF-LSI Integrated Temperature Compensating Focuser (19702)


TCF-LSI Integrated Temperature Compensating Focuser (19702)

Regular price
$ 795.00
Sale price
$ 795.00
Unit price

This item is out of stock but you can place an order now and we’ll ship when it becomes available.


#17670 - Original TCF-S Focuser with USB/Serial control

Following the long tradition of the TCF-S Temperature Compensating Focuser, Optec's TCF-LSI features a robust 2-inch Crayford-style design for smooth focus.  The updated model is faster and offers greater versatility in the same compact, yet solid, focuser design.

The TCF-LSI has all of the control electronics integrated into the focuser body. This means that you do not need any external controller. Simply connect power and the control cable and you are ready to begin. The TCF-LSI uses the same drivers as the rest of our FocusLynx family of focusers.

As a robust Crayford style 2-inch focuser, the TCF-LSI drawtube accepts any of our 2-inch adapters developed especially for the TCF-S and TCF-Lynx focusers.  The optional 1-1/4" Centering Adapter allows any 1-1/4-inch diagonal or eyepiece to be added behind the focuser.  Visual users will appreciate the In-Out Keypad for no-touch operation of the telescope focus.


Overall Height: 3.3" (84mm) to 3.9" (99mm)
Focuser Travel: 0.6" (15.2mm)
Focuser Midpoint 3.6" (91.4mm)
Total Step Travel:   7,000 steps
Step Resolution:  2.2 microns
Weight:  2lb. 4oz. (1.0 kg)
Payload Capacity: 10-lbs. (4.5 kg)
Telescope-side Mount: OPTEC-2400 dovetail
Camera-Side Mount: 2-inch drawtube


Package Contents

  • TCF-LSI 2-inch Crayford-style Digital Focuser,
  • Optec USB/Serial communications cable, 6-ft. length
  • 12VDC 1.25A power supply - 110-240VAC input
  • UL/CSA compliant wall plug cord (included if With Hub selected),
  • 20-in Temperature Probe



Personal Upgrade Path

Buy risk-free: When it’s time to trade up you’ll get the most value for your used gear.