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    Often symbolised in detective stories magnifying glasses are used to make objects appear large. Magnifiers are also used by scientists at laboratories to take a closer look and study microorganisms like bacteria and fungi. A typical magnifying glass comprises of convex lens with a focal length of 25 cm and is usually referred to as the 2x ...

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    The preceding formulae including thin lens approximation and the simplified lens formulas deriving from it give a good starting point for analyzing the working of systems of lenses. As an example of this we can consider the simplest lens system of all: a single double-convex lens used as a 'magnifying glass'.

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    the lens's light transmission goes up by 8% or so because the large loss of light from the additional air/glass interfaces. the optical effect of errors in the figure of r2 or r3 becomes nil. In other words small surface irregularities don't degrade the image. These reasons seem to give one a strong impetus to make an oiled objective.

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    A reversed Kellner eyepiece was developed in 1975 and in it the field lens is a double concave/ double convex achromatic doublet and the eye lens is a double convex singlet. The reverse Kellner provides 50% more eye relief and works better with small focal ratios as well as having a slightly wider field.

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    A camera lens (also known as photographic 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 capable of storing an image chemically or electronically.. There is no major difference in principle between a lens used for a still camera a video camera ...

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    Close-up lenses or close-up filters are magnifying lenses mounted in front of photographic lenses and cine lenses to enable focusing closer than the lens will do by itself. They are quite useful to quickly obtain close-up images of small objects. Because they are usually simple single element plano-convex lenses there will be some quality loss but they're quick and easy and quite well accepted

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  • Lens Rentals Blog

    For those who missed all the excitement in Part 1 of this series I discussed that almost all modern SLR lenses derive from one of 6 types of lenses that were basically in use by the 1920s. Part 1 covered the first three lenses: the Symmetrical Double Gauss and Petzval lenses. Those three lenses give rise to almost every "standard range" prime lens (40 to 85mm) for SLRs and slightly ...

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