SKYOPTIKST 1.25" Zenith Diagonal Dielectric Mirror for Refractor Astronomical Telescope 99% Reflection Accessories 90 Degree

Multi-layered dielectric coatings that produce 99-percent reflectivity for brighter, sharper images.. 1.25 inches nosepiece fits 1.25 inches telescopes; accepts standard 1.25 Inch filters; eyepieces; Barlow lenses and other accessories. Diagonal provides a comfortable 90-degree viewing orientation when observing the night sky through a refractor telescope. Brass compression ring; Built in brass ring and thumbscrew accessories avoid eyepiece to rotate during adjustments; effortless fixes more firmly and will not scratch your eyepieces barrels. Machined and anodized aluminum housing features machine-threaded baffles for optimized contrast