SVBONY 2 inches 90 Deg Dielectric Mirror Diagonal for Astronomical Telescope with 1.25 inches Adapter
- Mirror Star Diagonal - 99% Reflectivity;Provides a Comfortable 90 Degree View from your Refractor.
- New 2" 90 deg 99% Dielectric Mirror Diagonal for Telescope With 1.25" adapter.
- has a 1/10th wave flat optical glass surface.
- 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....
- Dielectric diagonal is especially important.
- A standard aluminized diagonal has about 92% reflectance.
- And this decreases with time as the aluminum....
- 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....