Abstract
Two numbers, e.g. 10 × 50 or 11 × 80, designate a binocular. The first of these numbers is the magnification; the second is the diameter of the objective lenses in millimetres. For example, a 7 × 50 binocular has a magnification of ×7 and objective lenses of diameter 50 mm.
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© 2000 Springer-Verlag London
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Tonkin, S.F. (2000). Choosing Equipment. In: AstroFAQs. Patrick Moore’s Practical Astronomy Series. Springer, London. https://doi.org/10.1007/978-1-4471-0439-1_1
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DOI: https://doi.org/10.1007/978-1-4471-0439-1_1
Publisher Name: Springer, London
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Online ISBN: 978-1-4471-0439-1
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