Optec Inc. 2-inch to SCT Thread Adapter: Precision and Versatility for Astronomical Equipment

Secure SCT Adapter: Designed to securely fit 2" x 24tpi SCT male telescope threads, enhancing connection stability for various astronomical accessories.

Exceptional Precision: Maintains tight tolerances of +/- 0.003 inches, providing a slip-fit that is highly reliable and effective.

TCF-S Focuser Compatibility: Perfectly matches the three thumbscrews on the TCF-S focuser's drawtube, with a precision-machined dovetail to eliminate flexure.

Rugged Construction: Features a heavy wall and standard SCT-thread, making it rugged yet user-friendly for connecting to a wide range of SCT accessories.

Wide Compatibility: Suitable for use with Celestron f/6.3 telecompressors, various filter wheels, and camera faceplates, among other SCT accessories.

Considerations for Certain Filter Wheels: Advises caution with some SCT female threaded filter wheels that may not accommodate the full 0.4" thread depth without obstruction.

Optional Retaining Ring: Optec provides an optional retaining ring for those needing to limit the in-travel of the male SCT threads.

Easy Rotational Alignment: Includes a machined brass registration screw for easy alignment with TCF-S focusers, simplifying re-insertion and rotational alignment.

Ideal Camera Nosepiece: Acts as an effective 2-inch camera nosepiece, facilitating easy and accurate alignment in low-light conditions.

Removable Brass Screw: The brass registration screw can be removed for compatibility with non-Optec focusers, enhancing the adapter's versatility.

Specifications

Overall Outside Diameter: 2.38" (60mm)
Outside Diameter (main body): 1.995" (50.7mm)
Overall Height: 1.80" (45.5mm)
Height of SCT-threads: 0.400" (10.0mm)
Clear Aperture: 1.70" (43.3mm)
Weight: 2.4 oz (70 g)
Back-focus Usage: 0.25" (6.4 mm)

Camera-side Compatibility:

TCF-S or TCF-Si focuser,
TCF-S3 or TCF-S3i focuser with #17804 3-inch to 2-inch reducer,
Any manufacturer's 2-inch focuser or receiver.

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Optec Inc. 2-inch to SCT thread (2” diameter) adapter, fits directly into the 2” TCF focuser

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