Read e-book online Binocular Astronomy (The Patrick Moore Practical Astronomy PDF

By Stephen Tonkin

ISBN-10: 1846283086

ISBN-13: 9781846283086

This e-book includes every little thing an astronomer must learn about binocular gazing. The publication takes an in-depth examine the tools themselves. It has sections on comparing and purchasing binoculars and binocular telescopes, their care, mounting, and components. moreover there's a number of fifty effective gadgets to be noticeable with 50mm and 100mm binoculars.

The benefits of utilizing either eyes for astronomical gazing are many and massive, mostly as a result method the human mind methods visible info. This ebook allows the astronomer to maximise these advantages.

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Additional info for Binocular Astronomy (The Patrick Moore Practical Astronomy Series)

Sample text

This makes them slightly easier to pack and carry; some people (I am one) find the smaller size easier and more comfortable to hold because of the different ergonomics. • They are usually slightly lighter. This makes them easier to carry and generally less tiring to hold. • They are easier to waterproof because of the internal focusing. Although one does not normally do astronomy in the rain (the possible exception being the nocturnal equivalent of a “monkeys’ wedding”), nitrogen-filled waterproof binoculars are immune to internal condensation in damp/dewy conditions and will not suffer from possible water penetration when used for other purposes such as bird watching or racing.

Single-layer MgF2 coating on all other glass-to-air surfaces, including the hypotenuses of the prisms. • Level III: Broadband multi-coatings on all the surfaces except the prism hypotenuses, on which there are single-layer MgF2 coatings. • Level IV: Broadband multi-coatings on all the surfaces including the prism hypotenuses. (Kunming Optical Instrument Co. 19. 18. Broadband multi-coated optics: triple layer coating. 19. Optical coatings. Clockwise from top left: singlelayer coated, broadband multicoated, multicoated, uncoated.

8 times the smaller one; this is certainly closer to the experience of observing through them. 3 Choosing Binoculars 37 Field of View In addition to the magnification and aperture, the other numerical factor that is usually stated is the field of view. This is quoted in one of three ways: • Degrees. This is the most useful factor for astronomers, since it gives you an indication of the amount of sky you will be able to see. The area of sky that will be visible is directly proportional to the square of the angular field.

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Binocular Astronomy (The Patrick Moore Practical Astronomy Series) by Stephen Tonkin

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