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learning: infection control optometry atlas: overview of pathological conditions of the eye optometry quiz: test your knowledge about us log in log in sign up home news hearing optics general cet events online learning online learning: amd online learning: dry eye disease online learning: contact lenses...
as instagram are shot using 'traditional' cameras. we've chosen a selection of models that make it easier to shoot high-quality, compelling lifestyle images, whatever you intend to use them for. we've considered the need to offer a pleasant degree of background blur, the availability of wide-angle lenses...
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change of refractive index with temperature than germanium. applications germanium's most important application is in the form of germanium tetrachloride for optical fibres. applications in the field of infrared optics account for another sizeable part of germanium consumption. here it is used in lenses...
use misch metal (a rare earth alloy) containing lanthanum to produce sparks by friction. lanthanum is used in hydrogen sponge alloys, which take up to times their own volume of hydrogen gas. it is also used to make night vision goggles (infrared-absorbing glass). high quality camera and telescope lenses...
roofing material. lead sheet (as cu-alloyed pb) is also used in the chemical industry as an anti-acid lining, e.g. in the so-called 'lead chambers' process of sulphuric acid production. also used in crystal glass and in special glasses of the flint type with a high refraction index for achromatic lenses...
mm-equivalent field-of-view and a fast internal-focus design. the mm will be available from 'summer ' at an expected selling price of around $ . fujifilm launches m-mount adapter for x-pro 's x-mount may , at : fujifilm has officially unveiled its promised adapter to allow the use of leica m-mount lenses...