TPO 8" f/4 Newtonian Reflecting OTA Telescope

The 203 mm (8-Inch) f/4 Imaging Newtonian Telescope by TPO:    If you are looking for a telescope that does a great job of imaging but doesn't come with the cost of a Ritchey Chretien, check out the TPO (Third Planet Optics) Imaging Newtonian line of telescopes! All of their Imaging Newtonian optical tube assemblies, offered in apertures from 6-inches to 12-inches, have very fast optics for the widest fields possible. Image with a DSLR or small webcam all the way up to large sensor CCD cameras with these inexpensive yet effective Newtonians. The optics on all TPO Imaging Newtonians consist of a parabolic primary mirror and an elliptical secondary, or diagonal. The mirrors are made from B270 white water optical crown glass, which is more thermally stable than glass traditionally used on other reflectors. A 91-percent aluminum coating is applied, and then over-coated with a layer of quartz for the ultimate in durability. The primary mirror cell is very sturdy, and has six collimation kno