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 ...

What are the real advantages of big scopes? The larger the telescope's diameter, the more light it will collect. A 4-inch refractor, for example, is a great scope for planets, the Moon ...

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 ...

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 ...