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Dioptre print that page

A dioptre , or diopter , is a unit of measurement of the optical power of a lens or curved mirror , which is equal to the reciprocal of the focal length measured in metres (that is, 1/metres). It is thus a unit of reciprocal length . For example, a 3 dioptre lens brings parallel rays

wikipedia.org | 2011/4/26 17:54:41

Fresnel lens print that page

Lentille_de_fresnel

A Fresnel lens ( / f r eɪ ˈ n ɛ l / fray- nel ) is a type of lens originally developed by French physicist Augustin-Jean Fresnel for lighthouses . The design allows the construction of lenses of large aperture and short focal length without the mass and volume of material that

Presbyopia print that page

The word presbyopia comes from the Greek word presbys (πρέσβυς), meaning "old man" or "elder", and the Neolatin suffix -opia , meaning "sightedness", [ 2 ] giving rise to the laymen's definition often seen in consumer articles or medical glossaries, "old eyes". [ 3 ] Contents

wikipedia.org | 2011/9/7 9:13:02

Kodak EasyShare P880 print that page

Kodak_P880_front

menu when accessory lenses are mounted. 2.5" 480x240 (115k) pixel LCD Panel EVF with 237k pixel Dioptre adjustment for EVF Built-in manual pop up Electronic Flash (GN 9 @ ISO 100) with external Hot shoe and classic flash connector. Special external Kodak flash P20 unit available works

Retinoscopy print that page

Refrarction_error_test

lens being one which has a focal length of the examiner's distance from the patient (e.g. +2.00 dioptre lens for a 50 cm working distance). Myopes display an "against" reflex, which means that the direction of movement of light observed from the retina is a different direction to that in

Sony Alpha 100 print that page

SonyDSLRAlpha100_VL

Another notable feature is an automatically vibrating CCD to remove dust each time the camera is shut off. The α 100 shipped from Sony and resellers by the end of July 2006 with MSRP prices of US$ 1000 with the 18–70 mm f/3.5–f/5.6 kit lens and US$ 900 body only. The camera retains the

Sony α 100 print that page

SonyDSLRAlpha100_VL

Another notable feature is an automatically vibrating CCD to remove dust each time the camera is shut off. The α 100 shipped from Sony and resellers by the end of July 2006 with MSRP prices of US$ 1000 with the 18–70 mm f/3.5–f/5.6 kit lens and US$ 900 body only. The camera retains the

Kodak Ektra print that page

Kodak_Ektra_img_0790

the 35mm lens needed an external lens to be put in front of the finder. The viewfinder also had a dioptre adjustment, from -3 to +3 dioptres. The rangefinder of the Ektra had a very large base, but it was not integrated in the viewfinder. The Ektra had interchangeable lenses with a breech

RZ67 print that page

Rz67proykkonenjalustalla

The Mamiya RZ67 line of medium format single-lens reflex cameras manufactured by Mamiya includes three successive models, the RZ67 Professional (first model released in 1982), RZ67 Professional II (released in 1995) and RZ67 Professional IID (released in 2004). RZ67 is a modular camera

Prism correction print that page

commonly specified in prism dioptres , a unit of angular measurement that is loosely related to the dioptre . The prism dioptre of a lens is equal to one hundred times the tangent of the angle by which it displaces an image seen through the lens. Prism dioptre is represented by the Greek

wikipedia.org | 2011/7/28 15:40:56