Optec TCF-S3 - 3" ID Temperature Compensating Focuser

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Optec TCF-S3 - 3" ID Temperature Compensating Focuser
Item # OP-17677
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  • Check out the Optec TCF-S3 3" Temperature Compensating Focuser!
  • Functions like the TCF-S, but made for instrument loads of up to 25 lbs. A Serial Version with RS-232 I/O.
  • The Optec Temperature Compensating Focuser TCF-S3 has 3/8-inch diameter high-speed steel drive shafts for maximum load without bending or wear.
  • Includes temperature probe, control box, 6' Optec Control Cable and power supply.
  • Order telescope mount, control cable, serial operation accessories and optional adapters separately.


Optec 3” TCF-S3 Focuser

The TCF-S has a new big brother - the TCF-S3. This 5 pound focuser has all the same features of the TCF-S but is just bigger and stronger. With the every increasing size of CCD cameras and associated instruments, the need for a precision digital focuser that can take the weight and is compatible with most of the camera control software available is now met.

No corners were cut with this model. The massive drawtube has a 3.00-inch I.D. and is made from 7075, the strongest of the commercial aluminum alloys. To prevent any slippage common to Crayford style focusers, the drive rod is pressed onto the drawtube with a force of about 500 pounds. The TCF-S3 can take this extreme pressure because the drive rod is made from a ground bar of high speed steel with a diameter of 0.375 inch. Hardened rails of stainless steel are embeded in the drawtube to engage the drive rod and take the strain.  

The total linear travel of the drawtube is 1.00-inch with a resolution of 0.0001-inch. Like the TCF-S, a control box with IN and OUT pushbuttons, serial computer interface and digital display control all functions of the TCF-S3. All other features of the TCF-S3 are similar to the TCF-S. It uses the same cables, temperature probe and the new remote keypad.

You can read more about the TCF-S by following the link in the "Images/Articles" tab. Please remember that you will need to choose your telescope mount & control cable from the "Accessories" tab, and, depending on your set-up, you may need other items. If you need help choosing these items, feel free to contact us.

Optec Product Number: 17677

Additional Information

Additional Information

SKU OP-17677
Manufacturer Optec
Focuser or Mask Size 3" Drawtube
Focus Control Digital
Warranty 1 Year Warranty
Included Items

Included Items

  • Optec 3” TCF-S3 Focuser
  • Temperature Sensor Probe with 20” Cable
  • Optec Control Cable- 6 Feet
  • Hand Controller with Precision Digital Display (DRO) and IN/OUT Manual Focus Push Buttons.
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