This 2.9” long by 2” diameter two-part adapter tube lets you use conventional 2” refractor-type star diagonals (with a 2” diameter barrel that fits into a refractor’s 2” focuser drawtube) on a Schmidt-Cassegrain’s threaded rear cell.
With some smaller aperture telescopes and some 2” diagonals, the 2.9” body of this adapter may let the diagonal hit the drive base when the scope tries to swing the diagonal through the telescope forks. This can be a problem with some computerized scopes when they try to aim at the zenith while in the altazimuth mode. You will need as much as 7.5” of clearance between the rear cell of your Schmidt-Cassegrain and the tallest point on your telescope drive base to allow this adapter and many 2” diagonals to clear the base when aimed at the zenith. If the clearance is tight, you can unthread and remove the lower portion of this adapter. This shortens the length of the adapter to 1.6”, giving you an extra 1.3” of clearance.
One side of the 7 ounce adapter is threaded to attach onto the 2” diameter rear cell threads of 8” and larger Celestron and Meade Schmidt-Cassegrains. The 2” barrel of a conventional 2” star diagonal slips into the other side of the adapter tube and is held firmly in place by two ball-head thumbscrews.
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