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Directories: Some devices provide directories that guide users to easily target specific attractions within a tower viewer's field of vision.; Focus, magnification, and power: Some devices focus automatically, while others permit users to manually adjust a viewer's focus and magnification to suit their individual needs.
Tower Optical Company, Inc. is a small, Norwalk, Connecticut-based company which has manufactured a binocular tower viewer used at major tourist sites in the United States and Canada since 1932. [1] The company's large, silver-colored devices are used at Niagara Falls , the Empire State Building and other locations.
Close focus distance is the closest point that the binocular can focus on. This distance varies from about 0.5 to 30 m (2 to 98 ft), depending upon the design of the binoculars. If the close focus distance is short with respect to the magnification, the binocular can be used also to see particulars not visible to the naked eye.
The binoculars series was updated and modified several times throughout its production history and switched to Schmidt-Pechan roof prism systems around 1990, which also brought a new series onto the market. These binoculars, which have been on the market for high-quality compact binoculars for a long time, had the optical parameters 8×20 and ...
Magnifications less than 20× are unusual, as are magnifications more than 60× since the latter can lead to poorer image brightness, a narrow field of view and too much image shaking, even on a tripod. The eyepiece mount layout can be "straight-through" (the eyepiece is on the same axis as the scope body), or "angled" (the eyepiece is at an ...
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