By James Mullaney
This can be a superb e-book for me. i'm studying approximately astronomy/stargazing, and likewise searching for suggestion in relation to buying my first telescope. The booklet is drastically aiding me to higher pick out my first telescope. The publication additionally comprises information regarding add-ons for telescopes and binoculars, it additionally includes quite a lot of knowledge on astronomy. i'm completely satisfied that i bought this publication.
Read Online or Download A Buyer's and User's Guide to Astronomical Telescopes & Binoculars (Patrick Moore's Practical Astronomy Series) PDF
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Additional info for A Buyer's and User's Guide to Astronomical Telescopes & Binoculars (Patrick Moore's Practical Astronomy Series)
Example text
25, C11, and C14, respectively) were added to the line. (Celestron also made a limited number of 22-inch SCTs for private observatories. ) A variety of unique computer-driven, altazimuth, single-arm fork and traditional German equatorial mountings are offered, from basic Go-To systems known as “NexStar” to state-of-the-art GPS systems. Prices today begin under $1,000 for the basic 5-inch, while the 8-inch computerized NexStar goes for around $1,400. The advanced 8-inch GPS model is priced at $2,000 and the 11-inch at under $3,000.
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.
This not only provides a vivid demonstration of the Telescope Basics 25 rotation of the planet on which we live, but with lines of people waiting to look through the telescope (at a public star party, for example), it naturally limits the viewing time per person! And the slow drifting of objects in the eyepiece – especially faint ones such as nebulae and galaxies – causes their images to move across varying parts of the retina, often revealing subtle details that might otherwise be missed. Whatever size and type instrument you may be thinking of purchasing, remember that the best telescope for you is the one you will use the most often.