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.
Bargain Deal: £79.99