Big binoculars are commonly known as observation binoculars. This type of binocular features objective lenses of diameters of 70mm and upward (to 150mm). They are excellent for astronomers and long range terrestrial observations. Observation binoculars are strongly built in order to maintain collimation (optical alignment) of the two sides. It becomes more difficult to maintain as the power is increased. To achieve better results such binoculars need very sturdy tripods. big binoculars are ideal for naturalists, bird-watchers, wardens, fire-watchers, coastguards, yachting club members, executives, estate managers, security staff and hotel guests. Some of the advantages are better light grasp, higher resolution, and opportunity of high magnifications while using both eyes, long focal lengths to minimize color dispersion and improve depth of field.
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