Description
This 2 dielectric mirror-type star diagonal is an outstanding value. At this low price, if there ever was a bargain in astronomy, this is it.
This 2 Astro-Tech first-surface mirror star diagonal has state-of-the-art 46-layer dielectric mirror coatings for a full 99% reflectivity, higher than the 88% of a conventional aluminum diagonal or the 96-97% of an easily-tarnished silver diagonal.
The durable ion-deposited dielectric coatings on the mirrors finely-polished 10mm thick 1/10th wave BK7 optical glass substrate also provide higher contrast and resolution during critical planetary, lunar, and binary star observations.
The supplied 1.25 eyepiece adapter uses a compression ring to hold eyepieces in place. The scope-side barrel of the 1.25 adapter has a subtle slanted groove to keep it from accidentally slipping out of the 2 diagonal. Dust covers are provided for the 1.25 adapter and the diagonals 2 barrel.
The interior of the diagonal body and the inside of the focuser-side barrel are treated with light absorbing materials. The focuser-side barrel is also internally anti-reflection threaded for even higher contrast. The barrel is threaded to accept standard 2 filters.
A subtle slanted groove cut into the outside of the focuser-side 2 barrel engages with your telescopes focuser thumbscrew to act as a safety stop. This keeps the diagonal from falling should the scopes thumbscrew loosen slightly from cold or use.
This diagonal is a visible improvement over the conventional 2″ diagonal provided with many refractors capable of using 2 optics. It can also be used with a Schmidt-Cassegrain or Maksutov-Cassegrain telescope with a suitable adapter, such as the #7785C. It is an absolutely premium 2 99% reflectivity dielectric self-centering star diagonal at a fraction the price of competitive models with equivalent performance and build quality. The same performance, for as little as half the price. If there ever was a bargain in astronomy, this is it.
Tech Details:
| Weight | 17 oz. |
|---|---|
| Warranty | 1 year |
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