In 1991, it started to produce glass molded aspheric lenses, and in 1996 plastic molded aspherical lenses.
2.
Ultra Low dispersion glass was another Canon innovation, as was aspherical lens elements for high speed normal and wide angle lenses.
3.
The lens is constructed with a hybrid aspherical lens that when combined with two glass mold elements provides excellent correction for distortion as well as astigmatism.
4.
However, with modern manufacturing techniques the extra cost of manufacturing aspherical lenses is decreasing, and small aspherical lenses can now be made by molding, allowing their use in inexpensive consumer cameras.
5.
However, with modern manufacturing techniques the extra cost of manufacturing aspherical lenses is decreasing, and small aspherical lenses can now be made by molding, allowing their use in inexpensive consumer cameras.
6.
Other materials are also used, such as quartz glass, fluorite, plastics like aspherical lens elements which are difficult or impossible to manufacture in glass, and which simplify or improve lens manufacturing and performance.
7.
On Aug 5, 2014 Ametek announced that it had completed its acquisition of Luphos GmbH, a firm which produces non-contact metrology technology used in the measurement of complex aspherical lenses and optical surfaces.
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Also, can't you just make the grinder aspherical is well and you can start grinding aspherical lenses in the exact same fashion ?-- G 04 : 55, 10 December 2007 ( UTC)
9.
5 all-aspherical lens elements are used, making it possible to increase border-sharpness and lower Tessar, it has almost nothing in common with the 4 element in 3 group, non-aspherical original Tessar.
10.
For aspherical lenses, the design should be able to tolerate 0.010 mm of lateral shear between surfaces plus 5 micrometres Total Internal Reflection of wedge ( across the part without considering the lateral shear ) to be considered robust.
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