1.25-inch aperture; SV222 45 degree diagonal is 1.25-inch aperture; strong versatility; can be applied to 1.25-inch eyepieces and astronomical accessories The image is clear and bright; correct image diagonal adopts a 45-degree upright prism; with full multi-layer coating and phase coating; the image contrast is high; the picture is clear and bright Delustering design; blackened and baffled inside; it can prevent internal stray light reflection The installation is stable; brass pressure ring design; SV222 45 degree diagonal is firmly connected with the eyepiece and does not shake; it will not scratch the eyepiece Metal material; 1.25 inch SV222 telescope diagonal is made of aluminum alloy metal material; with black anodizing; sturdy and durable SV222 45 degree diagonal mirror, 1.25 inch telescope diagonal with FMC and phase coating, correct image diagonal for refractor telescope. 1.25-inch aperture, strong versatility, can be applied to 1.25-inch eyepieces and astronomical accessories. The image is clear and bright, full multi-layer coating and phase coating. Delustering design, blackened and baffled inside, it can prevent internal stray light reflection.SV222 correct image diagonal can be applied to planets, visual observation of astronomical scenes such as deep space, suitable for refracting telescopes.Easy to install, large chrome thumbscrew, easy to hold, easy to install. Optical Design: Prism Diagonal Inner Connection (Lens Sided): Thread M28.5x0.6 Outer Connection (Lens Sided): Barrel 1.25inch Inner Connection (Eyepiece Sided): Clamp 1.25inch Coating: Fully Multi-Coated + Phase Coatings Image Orientation: Erect image, non-reversed Optical Length: appr. 93mm Clamping System: Screw clamps Deflection Angle: 45° Clear Aperture: 16mm Body Material: CNC Metal Aluminum Prism Material: BK7 Net Weight: 167g/5.87oz. Package Includes: SV222 1.25" 45 Degree Metal Correct Image Prism Diagonal 1X M4 Screws 1X Dust Cap 1X Dust Plug