Svbony SV188P Dielectric Diagonals for Refractors - F9171

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There are many 1.25" and 2" star diagonals on the market. Many of them have a mediocre mirror quality with 90% reflectivity (10% loss) and a plastic body. These diagonals by SVBONY stand for a high-quality alternative to those cheap parts. It offers excellent image and mechanical quality. There's no vignetting over the full field. SV188P features sophisticated, Multi-layered dielectric coatings that provide an astounding 99% reflectivity for maximum view brightness and sharpness. SV188P Diagonals provides a comfortable 90-degree viewing orientation when observing the night sky through a refractor. When use the SV188P with Maksutov-Cassegrain (Mak-Cass) or Schmidt-Cassegrain telescope, you need a special adapter. Another advantage is the nosepiece barrel is threaded to accept 1.25" and 2" filters (based on the diagonal model size). Brass lock Screw and Brass Compression Rings feature more precision and prevent barrels or the surface of eyepieces from marring and scratching. Specifications Brand SVBONY Model Number SV188P SKU F9171B F9171D Size 1.25inch 2inch Optical Design Mirror Diagonal Mirror Diagonal Coatings Dielectric Reflectivity dielectric 99% coating for bright images Material Aluminum Alloy Filter Threads M28.5*0.6 M48x0.75 M4 Set Screws Yes Outer Connection(Lens Sided) Barrel 1.25inch Barrel 2inch Inner Connection(Lens Sided) Thread M28.5x0.6 Thread M48x0.75 Inner Connection(Eyepiece Sided) Clamp 1.25inch Clamp 2inch Reflection Surface Dielectrically Coated Image Orientation Erect Image, Mirror Inverted Thickness of Mirror 11mm Net Weight 125g / 4.41oz 463g Show more