Whether you're looking to build a telescope system from scratch, or wish to upgrade your "kit" Star Diagonal, the Altair Astro 2 inch Quartz Dielectric Diagonal offers 99% reflectivity due to its multi-layer dielectric coatings, and extreme durability thanks to its CNC machined aluminium casing. It has a non-marring brass compression ring to prevent damage to your eyepieces and comes supplied with two protective dust caps in foam-lined presentation box. The Fused quartz medium expands and contracts less than regular glass. It's also harder, has less internal stresses and polishes better. As a result, quartz mirrors are slightly, yet consistently smoother and flatter than glass equivalents after coating.
Altair Astro 2 Inch Quartz Dielectric Diagonal:
The multi-layer dielectric coatings on these diagonals are so incredibly reflective, it's difficult to see the actual mirror surface when looking into it.
The coatings are also more durable than aluminium coatings and because they do not oxidise, and are extremely scratch resistant, they are easier to clean.
This push-fit version will fit telescopes with a 2 inch push fit aperture in the focuser and is threaded for filters. It has an internal blackened thread to stop stray light reflection, increasing image contrast.
A precision machined low profile 1.25 to 2 inch eyepiece adapter with brass compression ring is also included, designed not mar your eyepiece barrels.
The low profile adapter has a corresponding slot machined into the diagonal body to lower it even further. This achieves as much "infocus" as possible for users who would like the focal length of their telescope to stay as close to design parameters as possible.
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