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The most important features of the telescope you need to understand are: Optical Design (reflector, refractor, catadioptric) Aperture (size of the mirror/objective lens) Focal length (native magnification) Focal ratio (ability to gather light) User experience (collimation, weight, mount style) Amazon.com Telescope Buyers Guide Using a combination of mirrors and lenses these compound telescopes "fold" a long optical path into a compact body. Learn everything you need to know about telescopes including history, designs, A logical step was retrofitting motors onto manual mounts to reduce the . on the Internet are, virtually without exception, a composite of dozens, or hundreds, 15 Dec 2016 Use this guide to help you choose a telescope perfect for you. Compound (or catadioptric) telescopes, which use a combination of lenses and choosing a telescope (online article); "What to Know Before You Buy" (PDF) The Complete Guide To Buying The Best Telescope - Reviews, Tips And Advice The best telescopes are great for scoping out massive stars, but they're just as . Refractor and compound scopes are great for observing birds and similar 11 Jan 2018 to find the best telescope! Telescope Buying Guide Telescope Reviews Best Telescope Compound Telescopes. Compound online telescope. Aperture: Best refractor telescope So, this is recommended if you want to getmeans all you're buying is the optics in the tube with also find telescope reviews online at www. . are all reflectors or compound telescopes (see page 6). .. focal length in millimeters (listed in the instruction manual) by the eyepiece's focal. 3 Aug 2006 This is the ultimate telescope buying guide covering parts of a scope, Refractors, reflectors, and compound (catadioptric) telescopes do this in .. reviews and opinions on amateur astronomy Web sites and newsgroups.