Astro-Tech High Quality 1.25" Diagonal - Excellent Condition!
From site:The Astro-Tech 1.25" diagonal has state-of-the-art 46-layer dielectric mirror coatings for a full 99% reflectivity. This is markedly higher reflectivity than the 88% of a conventional aluminum diagonal or the 96-97% of an easily-tarnished silver diagonal.
The mirror housing is precision-machined from solid aluminum, rather than simply flimsy Bakelite plastic or a sheet metal stamping, as you'll find with ordinary diagonals. A rigid machined metal backplate with stainless steel hardware holds the mirror in perfect optical alignment in the machined body. The interior of the body is anodized an anti-reflective matte black. The focuser-side barrel is also anodized anti-reflective matte black, and is internally antireflection threaded for even higher contrast. The barrel is threaded to accept standard 1.25" filters.
The 1.25" eyepiece holder uses a non-marring soft brass compression ring to clamp eyepieces in place, rather than a thumbscrew that can scratch an eyepiece barrel by tightening down on it directly.
A shallow slanted groove cut into the outside of the focuser-side barrel engages with the scope's visual back or eyepiece holder thumbscrew to act as a safety stop. This keeps the diagonal from falling should the scope's thumbscrew loosen slightly from cold or use. Dust covers are provided for both sides of the diagonal.
We got this gently used diagonal in as a trade. It is in excellent condition. Comes with both caps. Price includes USA shipping.
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Filed under: Eyepieces & Accessories