a field lens is
71History 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… …
72Kerr-lens modelocking — (KLM) is a method of modelocking lasers via a nonlinear optical process known as the optical Kerr effect . This method allows the generation of pulses of light with a duration as short as a few femtoseconds.The optical Kerr effect is a process… …
73Canon EF 35mm lens — The EF 35mm lenses are a group of wide angle prime lenses made by Canon Inc. that share the same focal length.Focal lengths of 24mm to 35mm are considered wide angle. So the focal length of these lenses are at the long end of the wide angle range …
74Perspective control lens — (a) Keeping the camera level, with an ordinary lens, captures only the bottom portion of the building. (b) Tilting the camera upwa …
75Electrostatic lens — An electrostatic lens is a device that assists in the transport of electrons emitted from a sample to an electron analyzer, analogous to the way an optical lens assists in the transport of light in an optical instrument. The recent development of …
76Photographic 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… …
77Canon EF 500mm lens — Infobox photographic lenses name = EF 500mm f4/L USM caption = From left to right : EF 28 300mm f/3.5 5.6L IS USM, 70 200 f/2.8L IS USM, 300mm f/2.8L IS USM, 500mm f/4L IS USM maker = Canon feat is = y feat usm = y feat sbf = feat macro = feat… …
78Canon EF 85mm lens — The EF 85mm lenses are a group of medium telephoto prime lenses made by Canon Inc. that share the same focal length.These lenses have an EF type mount, that fits the Canon EOS line of cameras. Focal lengths of 70mm to 200mm are usually used for… …
79Progressive lens — View through a progressive lens at some distance. In normal use, a much smaller section of the glass is used, so that the distortion is much smaller. Progressive spectacle lenses, also called progressive addition lenses (PAL), progressive power …
80Single-lens reflex camera — The single lens reflex (SLR) camera uses an automatic moving mirror system which permits the photographer to see exactly what will be captured by the film or digital imaging system, as opposed to non SLR cameras where the view through the… …
