For the popular 35 mm film format, typical focal lengths of fisheye lenses are 8–10 mm for circular images, and 12–18 mm for diagonal images filling the entire frame. Mass-produced fisheye lenses for photography first appeared in the early 1960s and are generally used for their unique, distorted appearance. Their focal lengths depend on the film format they are designed for. The angle of view of a fisheye lens is usually between 100 and 180 degrees, although lenses covering up to 280 degrees exist (see below). : 145 Their first practical use was in the 1920s for use in meteorology to study cloud formation giving them the name "whole-sky lenses". Wood based on how a fish would see an ultrawide hemispherical view from beneath the water (a phenomenon known as Snell's window). The term fisheye was coined in 1906 by American physicist and inventor Robert W. Chromatic aberration can clearly be seen toward the outer edges. Instead of producing images with straight lines of perspective ( rectilinear images), fisheye lenses use a special mapping ("distortion" for example: equisolid angle, see below), which gives images a characteristic convex non-rectilinear appearance.Ĭircular fisheye photograph of Oude Kerk Amsterdam. : 145 Fisheye lenses achieve extremely wide angles of view, well beyond any rectilinear lens. Wood (1905), Bond (1922), and Hill (1924) Ī fisheye lens is an ultra wide-angle lens that produces strong visual distortion intended to create a wide panoramic or hemispherical image. eBay is not affiliated with or endorsed by Sigma or Nikon.Wide-angle photographic lens with strong barrel distortion Fisheye Content provided for informational purposes only. Once detached from the Nikon body, you can clean your HSM with a soft cloth to remove any water or dust on the glass. While shooting, many photographers will also have either a cap for their Sigma or a filter to cover the glass on their HSM, EX DG, or DG. A simple padded bag can hold both the Nikon body and a range of autofocus DG lenses. How do you properly clean and store your Sigma lenses?Īn EX DG zoom for a DSLR or analog film body should be detached from the body to be properly stored. That sound means the lens has attached itself to the body of the camera.
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