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With a heavy wall and astronomy industry standard SCT-thread, the #17665 is both rugged and easy to use. The long SCT thread will screw into any adapter or receiver including most any SCT accessory, the Celestron f/6.3 telecompressor body, many filter wheels, and a several camera faceplates.

A word of caution, however, some SCT female threaded filter wheels will not allow the full 0.4" of thread to be screwed into the filter wheel body without obstructing the filter wheel. Contact Optec for an optional retaining ring to limit the in-travel of the male SCT threads.

The wide flange on the 2-inch to SCT thread adapter features a machined brass registration screw to exactly match the notch on all TCF-S focusers. This allows easy rotational alignment each time the #17665 is removed and re-inserted into the 2-inch drawtube making it especially suited as a 2-inch camera nosepiece. No more fumbling in the dark to re-align your camera or accessory. Simply slide the 2-inch nosepiece into the focuser drawtube, rotate until the brass screw drops into place, and lock down the thumbscrews. The brass registration screw can be easily removed when using a non-Optec focuser.