Orion’s ED80T CF Apochromatic Refractor Telescope is a 3.15-inch (80mm) f/6 optical tube assembly. It comes with a 2″ dual-speed Crayford focuser, a 2″ dielectric star diagonal, a 2″-to ...

The telescope is a 2-inch (50mm) apochromatic triplet reflector with a focal ratio of f/5, ideal for a wide-field view of deep sky objects like galaxies, nebulas and open star clusters.

Recently, I observed through the 4-inch f/6.4 SV4 apochromatic refractor from Stellarvue Telescopes. At the heart of the SV4 is LOMO’s fully multicoated objective. Made with three air-spaced ...