Download Choosing and Using a New CAT: Getting the Most from Your by Rod Mollise PDF

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By Rod Mollise

Choosing and utilizing the recent CAT will supersede the author’s profitable Choosing and utilizing a Schmidt-Cassegrain Telescope, which has loved enthusiastic help from the novice astronomy neighborhood for the earlier seven years.

Since the 1st e-book used to be released, much has replaced within the expertise of novice astronomy. The sophistication and diversity of the telescopes on hand to amateurs has elevated dramatically. automated SCTs, Maksutov-Cassegrains, and such a lot lately Meade’s new and acclaimed Ritchey-Chrétiens have come to dominate the marketplace. that suggests that each one amateurs contemplating the acquisition of a brand new telescope (not just a SCT, and never simply newbies) will reap the benefits of this special consultant. selecting the best telescope for specific different types of commentary (or even for normal paintings) is much from effortless – yet Rod Mollise supplies priceless recommendation and guidance.

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Read or Download Choosing and Using a New CAT: Getting the Most from Your Schmidt Cassegrain or Any Catadioptric Telescope (The Patrick Moore Practical Astronomy Series) PDF

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Extra resources for Choosing and Using a New CAT: Getting the Most from Your Schmidt Cassegrain or Any Catadioptric Telescope (The Patrick Moore Practical Astronomy Series)

Sample text

They are considerably easier to balance than fork-mount scopes, and that helps a lot when pushing the scope along after the battery dies. Is a German mount better than a fork? In some ways, it is. Despite the aforementioned smaller RA gears on some GEMs, most of the German mounts seem to track better than similar-quality forks. In large part, this is because they are easier to balance. Unlike a fork, a telescope on a German mount is easily balanced in RA by moving the counterweight up and down its shaft.

44 Choosing and Using a New CAT Plate 13. (LXD 75 SCT) Meade LXD75 8-inch Schmidt Cassegrain. Credit: Image courtesy of Meade Instruments Corporation. This mount is very similar to Japanese scope maker Vixen’s renowned Great Polaris GEM, if not as sturdy or well finished. Most imported GEMs in this payload class (20 pounds) are “clones” of the Vixen. The LXD75 tube itself does not feature frills, like the mirror locks and motorized Crayford-style focusers found in the high-end Meade telescope, but the optics are the same as those used in the company’s other standard SCT OTAs and come equipped with Meade’s UHTC, on the primary mirror, secondary mirror, and corrector plate.

Finders are of two basic types. One is a small, low-power telescope with a magnification of about 6× to 12×. Some recent CATs use nonmagnifying zero-power (“unit power”) finders instead. These employ Inside a CAT 29 a red light-emitting diode (LED) and an optical window to “project” a dot or bullseye reticle on the night sky for aiming. Back at the front of the CAT, take another peep down the tube, this time focusing on the primary mirror. Looks pretty, doesn’t it? All bright and shiny? Due to the semi-sealed nature of the SCT’s tube (it is not exactly airtight), dust and dirt on the mirror are not usually a problem.

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