An Amateur's Guide to Observing and Imaging the Heavens by Ian Morison

By Ian Morison

An Amateur's advisor to gazing and Imaging the Heavens is a hugely finished guidebook that bridges the space among the rookies' and hobbyists' books and the various specialized and subject-specific texts for extra complicated beginner astronomers. Written via an skilled astronomer and educator, the publication is a one-stop reference delivering wide info and suggestion approximately gazing and imaging apparatus, with distinctive examples displaying how top to exploit them. as well as offering in-depth wisdom approximately all types of astronomical telescope and highlighting their strengths and weaknesses, chapters provide recommendation on making visible observations of the sunlight, Moon, planets, stars and galaxies. all kinds of contemporary astronomical imaging are lined, with step by step information given at the use of DSLRs and web-cams for sun, lunar and planetary imaging and using DSLRs and cooled CCD cameras for deep sky imaging.

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Example text

Happily, the vast majority of telescope optics are now excellent and, at a Scottish star party in January 2013, the image of the central region of the Orion Nebula as seen through a Celestron 11-inch Schmidt-Cassegrain was the best I have ever encountered – the stars making up the Trapezium showing as perfect pinpricks of light. A well-collimated Newtonian or Schmidt-Cassegrain whose mirrors have high-reflectivity coatings can be a superb telescope. How Is the Quality of a Mirror or Lens Assessed?

Few telescopes are now designed so that optical quality is the top priority. 25 ­super-planetary APO (now replaced by the APM 130-mm aperture telescope of 1,200-mm focal length) where the increased focal ratio over the more usual f7 ratio allows exquisite views of the Moon and planets. 5 may well perform better and is likely to be less expensive than one of f/6 or less. Oil-Spaced or Air-Spaced Triplets? 5). The advantages of an oil-spaced triplet have been described in relation to the TEC 140-mm refractor, but what advantages might an air-spaced triplet have?

94: less expensive and easier to work with than fluorite crystal with an Abbe number very similar to that of fluorite. Chemically more stable than fluorite. Also referred to as synthetic fluorite, or ‘SF’, glass. It is easier to design a colour-free lens using FPL-53 than glass with lower Abbe numbers, but it is somewhat harder to figure and does not maintain its shape as well with changes in temperature. Triplet lenses using fluorite or FPL-53 can give essentially perfect correction for chromatic aberration both in focus and outside of focus.

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