This Black Friday weekend, the Sky-Watcher EvoStar 120 APO Doublet Refractor is 20% off and I think it is a must-buy if you ...

It was soon realized that what was to become known as chromatic aberration was a limiting factor in refracting telescopes, and that this could be overcome by making lenses with longer focal length ...

The original instrument to occupy the 25-foot diameter dome was the 10.5-inch Bausch refracting telescope (f/15.5) installed in the brand new observatory in 1953. Bausch & Lomb Company gave the ...

Description: Specifications TV - 76TypeAPO (Doublet) Refractor (Elements/Groups: 2/1) Objective (mm) 76 Focal Length (mm) 480 Focal Ratio (f/#) 6.3 Drawtube/Focuser2-in ch, Focusmate dual-speed ...

Today is your last day to save serious money on telescopes, but you'll have to be fast, here are 9 you won't want to miss!

The standard telescope of Newton's time, the refracting telescope, was not ideal. Its glass lenses focused the different colors inherent in light at different distances. This resulted, at the ...

The Beaverlab Finder TW2 is not a smart telescope, but its design makes it unique. This 82mm/3.2-inch refractor is one of a kind in that a lightweight plastic camera can be attached to it in place ...