By James Mullaney
This new consultant presents an intensive review of astronomical binoculars and telescopes. It comprises particular updated details on resources, choice and use of just about each significant style, model, and version of such tools on today’s market.
A Buyer’s & User’s advisor to Astronomical Telescopes and Binoculars is written for beginner astronomers and would-be novice astronomers. an individual making plans to buy binoculars or telescopes for astronomy – no matter if as a primary tool or as an improve to the following point – will locate this ebook a treasure-trove of data and advice.
But that's simply the 1st a part of the booklet. the second one half is full of tricks and pointers on utilizing astronomical telescopes or binoculars – in impression, how one can get the very best effects out of your purchase.
Read or Download A Buyer’s and User’s Guide to Astronomical Telescopes & Binoculars PDF
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Extra resources for A Buyer’s and User’s Guide to Astronomical Telescopes & Binoculars
These marvels of technology were introduced by Celestron and Meade, and make it possible to locate thousands of targets essentially at the touch of a few buttons, while providing excellent tracking capabilities. However, for us purists, these devices take much of the fun out of celestial exploration and leave their users not knowing the real sky. 4. A modern example of a telescope using a massive German equatorial mount – in this case a 14-inch Celestron Schmidt– Cassegrain catadioptric. Like most of today’s highly sophisticated mountings, it features automated Go-To ﬁnding and tracking capability.
1. The optical conﬁguration and light-path of a catadioptric telescope. The form seen here is the Maksutov–Cassegrain, which uses a thick, steeply-curved meniscus lens to eliminate the aberrations of the steep spherical primary mirror. 2. 5-inch Maksutov–Cassegrain catadioptric, long considered the ﬁnest small telescope ever made. This beautiful instrument is truly a work of art, both optically and mechanically. It’s seen here in its tabletop altazimuth mode, but it also has legs to tip it into an equatorial position.
Having used classical Cassegrains ranging from 6 to 30 inches in aperture, I have never been impressed with their image quality. Not only do they have limited ﬁelds of view because of their long effective focal lengths combined with strong ﬁeld curvature, but the images themselves often seem to have a “softness” about them – certainly not like the crisp, sharp, well-contrasted images of a refractor or a Newtonian reﬂector. Many of the optical companies that traditionally offered Cassegrain reﬂectors commercially to the amateur astronomy market have switched instead to the Ritchey–Chrétien form discussed below.
A Buyer’s and User’s Guide to Astronomical Telescopes & Binoculars by James Mullaney