Reflectivity: 99% SV188P features sophisticated, Multi-layered dielectric coatings that provide an astounding 99% reflectivity for maximum view brightness and sharpness. 1.25in Diagonal 1.25in nosepiece fits telescopes with 1.25in focusers. Accepts standard 1.25” eyepieces, filters, Barlow lenses and other accessories with a 1.25in insert barrel. 90° Viewing Angle Diagonal provides a comfortable 90-degree viewing orientation when observing the night sky through a refractor, Maksutov-Cassegrain (Mak-Cass) or Schmidt-Cassegrain telescope Suitable for 1.25'' filter With 28.5x0.6 filter thread can connect with 1.25in filter directly, which is for astrophotography. Brass Compression Ring Brass lock Screw for eyepiece or adapter and brass Compression rings features more precision and prevent barrels or the surface of eyepieces from marring and scratching. Upright Image The Svbony fully metal 1.25" Mirrors Diagonal zenith mirror offers an upright figure which is but turned backward in left and right position. It is suitable in particular for astronomical observations. The mirror depicts clean and full of contrasts. Material: Aluminum Alloy Machined and anodized aluminum housing features machine-threaded baffles for optimized contrast Specifications: 1.Brand: SVBONY 2.Model: SV188P 3.Size: 1.25-Inch 4.Coatings: Dielectric 5.Reflectivity: 99% 6.Thread: 28.5*0.6 7.Material: Aluminum Alloy 8.M4 Set Screws 9.Net Weight: 125g / 4.41oz

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