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Crown glass (optics) Crown glass is a type of optical glass used in lenses and other optical components. It has relatively low refractive index (≈1.52) and low dispersion (with Abbe numbers between 50 and 85). Crown glass is produced from alkali-lime silicates containing approximately 10% potassium oxide and is one of the earliest low ...
Adjustable-focus eyeglasses. Adjustable focus eyeglasses are eyeglasses with an adjustable focal length. They compensate for refractive errors (such as presbyopia) by providing variable focusing, allowing users to adjust them for desired distance or prescription, or both. Current bifocals and progressive lenses are static, in that the user has ...
Initially gray cellulose acetate was used, but this was discontinued in 1968, with remaining stocks issued until exhausted. The replacement frames used black cellulose acetate. In the late 1970s, the lens shape was re-designed to the "S9". Black "S9" frames were released for a brief period, before brown cellulose acetate replaced the black. The ...
With prices starting at $60 per frame, prescription lenses included, Pair is already pretty affordable. However, for a limited time, Yahoo Life readers can save 15 percent on any Pair Eyewear ...
The Canon EF-S 55–250mm f/4–5.6 IS lenses are a series of telephoto zoom lenses for Canon EOS digital single-lens reflex cameras with a Canon EF-S lens mount. [1] [2] All versions of the lens provide a 35 mm equivalent focal length of 88–400mm, and are advertised by Canon as providing four-stop image stabilization.
The D5000 is a 12.3-megapixel DX-format DSLR Nikon F-mount camera, announced by Nikon on 14 April 2009. The D5000 has many features in common with the D90.It features a 2.7-inch 230,000-dot resolution tilt-and-swivel LCD monitor (D90 is 3.0-inch (76 mm), 920,000 pixel, without swivel or tilt), live view, ISO 200–3200 (100–6400 with Boost), 3D tracking Multi-CAM1000 11-point AF system ...
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