2 Inch 90 Degree SCT Diagonal Mirror with 1.25" Adapter for Telescope Suit for: C5 / C6 / c8 / 925 / c11 and conventional 2 inch telescopes 2 Inch Mirror Star Diagonal #93519 The 2 inch mirror diagonal is made from optically flat glass with high reflectivity coatings to maximize the image brightness through your 2 inch eyepiece. The diagonal comes with a retaining ring to thread directly onto the back of a schmidt-Cassegrain telescope .Additionally,the 2 inch diagonal comes with a standard 2 inch chrome draw tube that can be used iwht most telescope with 2 inch focusers. To replace the threaded retaining ring with the standard draw tube,simply unthread the retainning ring and attached tube from the base of the mirror housing.Insert the threaded end of the chrome draw tube in to the mirror housing opening.thread the draw tube into place until secure. 2'' SCT mirror diagonal with high performance XLT coatings 1/10th wave mirror is tested with an interferometer to ensure quality Housing is precision machined to achieve and hold good optical alignment. Includes a 2 to 1.25 adapter and aluminum carry case Features: 1. 100% Celestron Brand New2. Fully Metal, Premium dielectric coating3. 1.25" adapter and brass tightening ring achieving highest brightness, contrast and sharpness4. Precise machining, antireflection internal painting and high-glossy anodizing5. Sharp, bright image that will satisfy the most discriminating Astronomy enthusiasts6. Color: Black7. Net Weight: 581g/20.5oz8. Note: Designed for SCT telescopes