The new GSO 2" CNC machined dielectric diagonals offer an excellent mechanical and optical quality, the special feature as follow:
Premium 2" diagonal with durable dielectric coatings for 99% reflectivity for bright images and long lifetime
1/12-wave quartz mirror offers good thermal stability and minimal focus shift during long observing or imaging sessions
All-metal body with chrome barrel threaded for standard 2" filters
Comes with 2"-1.25" eyepiece adapter for maximum flexibility
If you want a high-end mirror diagonal for your refractor telescope, this GSO 2" Quartz Dielectric Diagonal Mirror is an excellent choice. GSO's 2" refractor diagonal features dielectric coatings with 99% reflectivity across the visible spectrum and a 1/12 wave quartz mirror. The all metal diagonal body is CNC machined. The combined result is a superb diagonal offering excellent mechanical and optical quality at a great price. Dielectric coatings are more durable than regular or enhanced aluminum coatings, so you will enjoy years of excellent performance from this product.