This 90 degree diagonal features 99% reflectivity due to its quality coatings on the mirror. It uses a 1.25" barrel and accepts 1.25" eyepieces and accessories.

• 90-degree diagonal features sophisticated, lab-tested dielectric coatings that boast an astounding 99 percent reflectivity
• Dielectric mirror coatings are more durable and more reflective than enhanced aluminum coatings
• Diagonal provides a comfortable 90-degree viewing orientation when observing the night sky through a refractor, Maksutov-Cassegrain (Mak-Cass) or Schmidt-Cassegrain telescope
• Machined and anodized aluminum housing features machine-threaded baffles for optimized contrast
• 1.25" nosepiece barrel is threaded to accept like-sized Orion eyepiece filters