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2. List of largest optical refracting telescopes - Wikipedia

   en.wikipedia.org/wiki/List_of_largest_optical...

   List of largest optical refracting telescopes. The Grande Coupole for the double refractor of Meudon, with roughly 83 cm (33 in) and 62 cm (24 in) aperture lenses on the same mounting, and making its debut in 1891. Refracting telescopes use a lens to focus light. The Swedish 1-m Solar Telescope, with a lens diameter of 43 inches, is technically ...

3. Gradient-index optics - Wikipedia

   en.wikipedia.org/wiki/Gradient-index_optics

   Gradient-index optics. A gradient-index lens with a parabolic variation of refractive index ( n) with radial distance ( x ). The lens focuses light in the same way as a conventional lens. Gradient-index ( GRIN) optics is the branch of optics covering optical effects produced by a gradient of the refractive index of a material.

4. Magnification - Wikipedia

   en.wikipedia.org/wiki/Magnification

   If the lens is held at a distance from the object such that its front focal point is on the object being viewed, the relaxed eye (focused to infinity) can view the image with angular magnification = Here, is the focal length of the lens in centimeters. The constant 25 cm is an estimate of the "near point" distance of the eye—the closest ...

5. Eyepiece - Wikipedia

   en.wikipedia.org/wiki/Eyepiece

   Eyepiece. A collection of different types of eyepieces. An eyepiece, or ocular lens, is a type of lens that is attached to a variety of optical devices such as telescopes and microscopes. It is named because it is usually the lens that is closest to the eye when someone looks through an optical device to observe an object or sample.

6. AOL Mail

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7. List of Minolta A-mount lenses - Wikipedia

   en.wikipedia.org/wiki/List_of_Minolta_A-mount_lenses

   These new lenses included 35–80 mm f /4–5.6 (with built-in lens cap), 80–200 mm f /4.5–5.6, 35–105 mm f /3.5–4.5, 70–210 mm f /3.5–4.5, and 100–300 mm f /4.5–5.6. [ 4 ] Some of the original lenses were updated and re-released with the same cosmetics and are known as "New" or "Restyled" versions; minor optical updates such as ...