1.25" 45-degree mirror star diagonal for refractor telescopes with 1.25" connector (not recommended for reflectors). This is a great diagonal for daytime terrestrial use and night time astronomy applications for telescopes or spotting scopes. Protective coating on the mirror to ensure a long life, metal barrel - for secure seating in the focuser. More comfortable viewing orientation as you observe from above, filter thread for any 1.25" filter. Accepts standard 1.25" eyepieces. High quality optical Prism inside rather than a mirror which makes your image clear and sharp.Item Weight: 4 Ounces. Finderscope: Reflex. Focus Type: Manual Focus. Objective Lens Diameter: 32 months. Eye Piece Lens Description: Prism. Brand: Astromania. Manufacturer: Astromania. Date First Available: August 17, 2015. Is Discontinued By Manufacturer: No. Best Sellers Rank: #20 in Telescope Diagonals. Customer Reviews: 4.0 out of 5 stars 18 ratings 4.0 out of 5 stars. Item model number: SKU_AM_DP1D452. : B073QNSV3X. Item Weight: 4 ounces. Product Dimensions: 4.42 x 2.8 x 2.11 inches.