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90-Degree Mirror 1.25-Inch Dielectric Diagonal Mirror 99% Reflectivity and Brass Rings

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$14.99

$ 6 .99 $6.99

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About this item

  • SPECIFICATIONS: 1.25-inch 90-degree diagonal mirror with 99% reflectivity, dielectric coatings, and brass compression rings.
  • USES: Dielectric coatings create a super-flat mirror, reducing light loss and providing over 99% reflectivity. The diagonals 90-degree viewing angle reflects the telescope's light path, offering a more comfortable view, ideal for observing overhead objects and astronomical viewing.
  • FEATURES: A built-in brass compression ring and thumbscrew prevent eyepiece rotation during adjustments, ensuring a firm hold without scratching barrels.
  • COMPATIBILITY: The 1.25-inch nosepiece fits 1.25-inch telescopes and accepts standard 1.25-inch filters, eyepieces, Barlow lenses, and other accessories.


This 1.25-inch 90-degree diagonal mirror features dielectric coatings for over 99% reflectivity, a super-flat mirror to reduce light loss, and brass compression rings. Ideal for astronomical viewing, its 90-degree angle offers a comfortable view of overhead objects. The built-in brass compression ring and thumb screw secure the eyepiece without scratching. It fits 1.25-inch telescopes and accepts standard 1.25-inch filters, eyepieces, Barlow lenses, and other accessories.