Material: GlassModel Number: DG412131Primary Mirror Diameter: 160mmSecondary Mirror: 35MmPackage:1pcs Main mirror 1pcs 35mm short-axis secondary mirror Concave spherical mirror, diameter: 160mm, focal length: 1280mm or 1300mm, aluminized surface and protective film. The short axis is the length of the short side of the secondary mirror. Secondary mirror short axis 35mm. D160F1280 D160F1300concave spherical reflector main mirror and 35mm short-axis secondary mirror. Discover a wide selection of telescope must-haves, including various eyepieces, Barlow lenses to double your magnification, and moon filters for comfortable lunar viewing. Our team will provide 24-hour support to help you choose the right accessories and is always committed to ensuring your satisfaction with every product. ASIN B0GYJ9X1TW Brand Generic Focus Type Auto Focus Model Name SBTDZSBTH-D160F1280-35 Finderscope Reflex Manufacturer Generic Model Number SBTDZSBTH-FB1EC3FC Number of Items 1 Objective Lens Diameter 1 millimeters Manufacturer Part Number SBTDZSBTH-FB1EC3FC Item Dimensions D x W x H 0.39 D x 0.39 W x 0.39 H