focus of lens
111Canon FL 1200mm lens — The Canon FL 1200mm f/11 was a super telephoto lens marketed by Japanese optical manufacturer Canon in June 1972. It was the longest super telephoto lens in the Canon FL system. Canon did not release an equivalent lens for the Canon FD mount, and …
112Focal distance or length of a lens or mirror — Focal Fo cal, a. [Cf. F. focal. See {Focus}.] Belonging to,or concerning, a focus; as, a focal point. [1913 Webster] {Focal distance, or length, of a lens or mirror} (Opt.), the distance of the focus from the surface of the lens or mirror, or… …
113Intraocular lens — An intraocular lens (IOL) is an implanted lens in the eye, usually replacing the existing crystalline lens because it has been clouded over by a cataract, or as a form of refractive surgery to change the eye s optical power. It usually consists… …
114Varifocal lens — A varifocal lens is a camera lens with variable focal length in which focus changes as focal length (and magnification) changes, as compared to parfocal ( true ) zoom lens, which remains in focus as the lens zooms (focal length and magnification… …
115Lenticular lens — A series of cylindrical lenses molded in a plastic substrate A lenticular lens is an array of magnifying lenses, designed so that when viewed from slightly different angles, different images are magnified.[1] The most common example is the lenses …
116Optical lens design — refers to the calculation of lens construction parameters (variables) that will meet a set of performance requirements and constraints, including cost and schedule limitations. Construction parameters include surface profile types (spherical,… …
117soft focus — noun : unsharpness of a photograph due to intentional diffusion of the lens image * * * noun [noncount] : a way of producing a photograph so that the edges of the image are not completely clear or sharp soft focus adj used a soft focus lens soft… …
118Prime lens — In film and photography, a prime lens is either a photographic lens whose focal length is fixed, as opposed to a zoom lens, or it is the primary lens in a combination lens system.Confusion can sometimes result due to the two meanings of the term… …
119Aspheric lens — An aspheric lens or asphere is a lens whose surfaces have a profile that is neither a portion of a sphere nor of a circular cylinder. In photography, a lens assembly that includes an aspheric element is often called an aspherical lens.The asphere …
120Canon FD 200 mm lens — Eight designs of Canon FD 200 mm lens were produced for the Canon FD lens mount. These spanned two generations (FD and New FD) and varied by aperture and macro ability. These photographic lenses were: Canon FD * 200 mm f/2.8 S.S.C.: This lens,… …
