Collimating a Classic Cassegrain telescope – or any telescope with more than one curved mirror – is not easy. Catalin from CFF Telescopes collimated this 400mm f/20 with an artificial star, a beam splitter and an optically flat mirror.
Reflectors
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What’s an infinity corrected objective, and why use it in macrophotography?
An infinity corrected objective is a lens used for macrophotography. It looks very much like a microscope lens, and when you pair it with a tube lens it has quite a few advantages over more traditional macro lenses.
How to attach your phone to a telescope using a saxon ScopePix
Having a telescope is awesome. You can look at all manner of things astronomical and wonder. For many people, though, just seeing the Moon isn’t enough. To quote my millennial daughter, “if there aren’t photos, it didn’t happen”. So how do you get a photo through a telescope (without breaking the budget)? Everybody has a…
Sky-Watcher HAC150 – a budget deep-sky fast astrograph
A quick look at the new Sky-Watcher Honders Advanced Catadioptric Astrograph, a 125mm f/2 catadioptric “camera-only” telescope. Is this baby RASA the new grab-n-go sensation?