Optec Inc. 2-inch to 1¼-inch Compression Adapter: Enhanced Grip and Versatility for Focusers

Improved Design: An upgraded version of the #17662 adapter, featuring enhanced grip and usability.
Solid Brass Compression Ring: Equipped with a brass ring with machined grooves to securely hold 1¼-inch eyepieces and prevent slippage.
Easy Operation with Gloves: Designed for simple tightening and loosening with just a 1/8th turn of the upper locking ring, even with gloved hands.
Precision Machined for TCF Focusers: Fits perfectly into the drawtube of TCF-S or TCF-Si focuser, as well as other standard 2-inch focusers.
Dovetail and Compression Features: Includes a dovetail cut for thumbscrew alignment and a non-marring brass compression ring for 1¼-inch eyepieces and camera nosepieces.
Self-Centering Capability: Automatically centers any 1¼-inch eyepiece or instrument nosepiece, ensuring optimal alignment.
M48x0.6mm Female Thread for Filters: Comes with an industry-standard thread for attaching 2-inch screw-in type filters.
Convertible to T-Adapter: Can be transformed into a T-adapter with male M42x0.75mm threads by removing the locking ring and compression ring.
Astronomy Technology Today Review: Featured in Erik Wilcox's review in the May/June 2010 issue of Astronomy Technology Today.
Versatile Astronomy Accessory: An essential tool for astronomers and astrophotographers seeking a reliable and versatile adapter for their telescopes.

Specifications

Overall Outside Diameter (locking ring): 2.20" (55.9mm)
Outside Diameter (main body): 1.995" (50.7mm)
Overall Height: 1.58" (40.2mm)
Clear Aperture: 1.25" (31.8mm)
Weight: 4.6 oz (130 g)
Back-focus Usage: 0.45" (11.5 mm)