Binoculars allow excellent moon views, and great viewing of star fields, comets and even deep sky objects. The image seen through monoculars appear in their correct orientation through the use of two prisms, whereas in most telescopes the images are inverted.
Magnification specifications of 8x42 or 10x42 are perfect for a variety of outdoor optics requirements. There are many different features to look for when making your purchase. If you bird by sitting in a favorite spot, then larger binoculars could be your choice.
You will need a magnification factor of at least 7, maybe up to 10 if you have a steady hand. Field-of-view is determined by magnification and the focal lengths of the objective and eyepiece lenses. Since the advent of the original coating, the technique has been refined, and there are several grades of lens coating available.
You can easily calculate it by dividing the aperture by the magnification so that 7 x 50 binocular has an exit pupil of just over 7mm. Nevertheless, the capabilities of binoculars appeal to both groups as they choose equipment that best fits their needs.
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