Observation

Choosing binoculars

When buying binoculars, take into account who will be using them— a child, for example, will need a smaller, lighter pair. Do not be tempted by binoculars that promise high magnification combined with a small aperture, as the resulting images will be faint and indistinct. Ideally, for astronomical use the aperture of a binocular in millimeters should be at least five times greater than the magnification figure. Binoculars with a smaller ratio are fine for daytime but will produce fainter images at night.

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