AstroFAQs pp 1-23 | Cite as

Choosing Equipment

  • Stephen F. Tonkin
Part of the Patrick Moore’s Practical Astronomy Series book series (PATRICKMOORE)

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.

Keywords

Dust Mercury Ghost Photography Adapter 

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Copyright information

© Springer-Verlag London 2000

Authors and Affiliations

  • Stephen F. Tonkin

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