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 ...

(For more on the controversy Galileo spawned, see His Big Mistake.) Building a better refractor The spyglass-turned-telescope had limitations, some of which Galileo was able to design around.

Save £26 on a refractor telescope that, with a 90mm aperture ... But as you can tell from these deals, you can still save big outside those events. However, if you're craving a serious step ...

They're in abundance, and you can also get big discounts on some of the best ... $97 at Amazon Save 25% on the Gskyer 70mm Alt-az refractor telescope at Amazon. This refractor comes complete ...

McKim Observatory still houses many of its original instruments, including a 9.53 inch Clark Refractor telescope, a meridian transit telescope, and a gravity driven chronograph. Missing from the early ...

In fact, the kind of travel telescopes that the big brands often sell are surely ... After all, as a refractor telescope it uses a lens to form an image so it’s necessary to stand behind the ...

Refractor telescopes use specialised lenses to gather and focus light into an image, displaying a magnified sky view. In contrast, reflector telescopes use curved mirrors to reflect light onto the ...