focus of lens
51focus — 1) n. the point at which rays of light converge after passing through a lens. 2) n. the principal site of an infection or other disease. 3) n. (in radiography) the point of origin of an X ray beam. 4) vb. (in ophthalmology) to accommodate (see… …
52focus — F/A/V the act of adjusting a lens to make the image appear clear, sharp, and well defined …
53Focus — FilmM adjusting the elements in a camcorder’s lens so that an image is sharp, or not, depending on the shot’s needs …
54Canon EF lens mount — The EF lens mount allows all the Canon EF lenses to be used on any of the Canon EOS line of cameras made by Canon Inc.Unlike the EF s breech lock predecessor, the FD mount, the EF mount uses a bayonet style mount. EF stands for Electro Focus :… …
55History of the single-lens reflex camera — The history of the single lens reflex camera predates the invention of photography in 1826/27 by one and a half centuries with the use of a reflex mirror in a camera obscura first described in 1676. Such SLR devices were popular as drawing aids… …
56Photographic lens — A photographic lens (also known as objective lens or photographic objective) is an optical lens or assembly of lenses used in conjunction with a camera body and mechanism to make images of objects either on photographic film or on other media… …
57Canon EF 135mm lens — EF 135mm f/2L USM= The Canon EF 135mm f/2L USM is a short or medium telephoto lens. The 135/2 is mainly used for portrait photography and for indoor sports, where the lighting is often poor. The fast f/|2|link=yes aperture makes the lens ideal… …
58Infinity focus — In optics and photography, infinity focus is the state where a lens or other optical device forms an image of an object an infinite distance away. This corresponds to the point of focus for parallel rays. The image is formed at the focal point of …
59Minolta STF 135mm f/2.8 T4.5* lens — Infobox photographic lenses name = Minolta STF 135mm f/2.8 [T4.5] * caption = maker = Minolta, Sony feat is = feat usm = n feat sbf = feat macro = n feat special = Smooth Transition Focus application = Smooth Bokeh type = Special Prime flength =… …
60Crossed lens — Lens Lens (l[e^]nz), n.; pl. {Lenses} ( [e^]z). [L. lens a lentil. So named from the resemblance in shape of a double convex lens to the seed of a lentil. Cf. {Lentil}.] (Opt.) A piece of glass, or other transparent substance, ground with two… …
