$62.99 (as of 13/05/2020 00:48 PDT details )
Features:
- Excellent Quality Dielectric Diagonal Mirror Star Diagonal , 99% Reflectivity Provides a Comfortable 90 Degree View from your Refractor Fits Standard 2 50.8 mm Diameter Focus Tubes Use Both 2 50.8 mm and 1.25 31.75 mm Eyepieces
- New 2 90 deg 99% Dielectric Mirror Diagonal for Telescope With 1.25 adapter full metal has a 1 10th wave flat optical glass surface solid aluminum housing threaded to accept standard 2 filters The 2 eyepiece holder uses a non marring brass compression ring to secure your valuable eyepieces. The 1.25 adapter also has a non marring brass compression ring
- Both sizes of eyepieces may be used and are protected from dings and scratches that would result from a standard set screw. This 2 diagonal works with any Refractor that accepts a 2 star diagonals. It can also be used with Schmidt Cassegrain or Maksutov Cassegrain with an optional 2 inch visual back See below
- Dielectric diagonal is especially important A standard aluminized diagonal has about 92% reflectance And this decreases with time as the aluminum mirror surface ages
- For the vast majority of the visible spectrum the reflectance does not vary more than about 0.1% below 100% And the dielectric surface does not age like aluminum This combination leads to the equivalent of a little more light grasp compared to standard diagonals