Ed

RO: Ed - extra low dispersion EN: Ed

Fotografie

Lenses containing elements made from ED glass help suppress chromatic aberration.
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Accuracy

Ed

Extra Low dispersion- usually refer to glass type. Glass with ED properties indicating special rare earthglass or special formulated glass that limiting or correcting of light rays passingthrough the lens elements to achieve all spectrum of colours to falls on the sameplane of focus - especially the Red and Blue spectrum and is usually more apply tolonger focal length lenses where the problem is more serious. First popularised byNikon s Nikkor lens line - with a gold lining in the front part of the lens. Pentax,Olympus use the same name as Nikon. Canon s version is called LD - withred lining and usually their lenses are white in color. While Minolta uses APO. Independentlens makers, like Tamron, uses LD, Sigma uses APO, Tokina s version is SD APO; allthese trade names are basically performing the same functions. Also please referto apodchhromatic . Check Nikon s terms page for more.

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Ed

Extra Low Dispersion glass made by Nikon for some of its lenses. It ensures apochromatic-like performance, with high contrast and sharper images. An ED lens is one that has ED glass in one or more of its elements.

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Ed (extra-low dispersion) glas

An optical glass developed by Nikon that is used with normal optical glass in telephoto lenses to obtain optimum correction of chromatic aberrations.

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Ed - extra low dispersion

Lentila construita din sticla speciala caracterizata prin indice de dispresie (a luminii colorate) foarte redus. Termenul este folosit de Nikon, Olympus, Pentax si Sony. Vezi si apocromat. .

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Ed - extra low dispersion

Obiectiv complex format din sticle crown, flint si din fluorina. In acest mod se obtine focalizarea corecta a culorilor fundamentale. Vezi apocromat.

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