In 1972, the U.S. proclaimed a contiguous zone extending from 3 to 12 miles offshore (Department of State Public Notice 358, 37 Fed. Reg. 11906 (June 15, 1972), consistent with the 1958 UN Convention on the Territorial Sea and Contiguous Zone.
The aperture of a lens is the opening in the diaphragm that controls how much light is allowed to reach your focal plane (film or sensor). The aperture is usually rated as a fraction of the focal length, hence the f/x.y nomenclature. The wider an aperture is, the more light it allows through, and the smaller the number under f/ is.
In photography, a viewfinder is what the photographer looks through to compose, and, in many cases, focus picture. 19 jul 2013 electronic viewfinders use a tiny electronic display much like the larger lcd screen on the back of all cameras, whereas optical viewfinders use there are different types of viewfinders used on the various digital cameras available today.