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So a 100mm camera lens as a focal length of 100mm, but a 100mm telescope has an aperture of 100mm.

Note that camera lenses are listed in terms of their focal length, but telescopes are listed in terms of their aperture (the size of the opening that gathers light). And I also own and shoot with a 65mm refractor. I have spent about 40 years photographing the wonders of the night sky with just a 5-inch refractor. While this is true, you don't really need a large telescope for astrophotography. For normal visual observing, many people say that the larger the telescope you get the better because large telescopes gather more light the better to see faint astronomical objects. There are lots of different telescopes that you can get. So a small refractor on a decent mount will minimize these problems. The best telescope for a beginner in astrophotography is a small refractor.īecause telescopes magnify the image, they also magnify any tracking problems. Astro-Physics 130 GTX - 130mm aperture, 780mm focal length f/6.3 triplet apochromatic refractor - $7,000.Tele Vue NP 101is - 101mm aperture, 540mm focal length, f/5.4, Nagler-Petzval apochromatic refractor - $4,000.Astro-Physics 92mm F/6.65 Stowaway - 92mm aperture, 612mm focal length, f/6.65 triplet apochromatic refractor - $3,750.Astro-Tech AT70ED - 70mm aperture, 420mm focal length, f/6 ED doublet refractor - $300.