Young or old all would agree that it is impossible to bird watch with out a pair of binoculars. Essentially, all binoculars and scopes are derived from classical telescopes, which consist, in their most basic fashion, of two lenses.
Will you be hunting, whale watching, or watching birds, or looking for a pair of military binoculars. The magnification factor tells you how many times larger the object will be magnified, a number of between 4 and 7 is ample for most applications. Many binocular lens cloths are available today, and generally they are meant for one-time use.
Generally, if the objective lens is 50 mm then it is considered to be a large binocular; if it is 42 mm, it is full size; if it is 32 mm, it is a mid size. Many binoculars have an option for attached lens covers that open and close as you make your observations. Magnification over ten generally causes the binoculars to lose some image crispness.
Many binoculars come with a front cover, which protects binoculars from the rays of the sun. If you are going on a long trip, binoculars will be excellent entertainment for kids.
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