एस्फेरिक इसके अंग्रेजी अर्थ का उदाहरण

Canon introduced a number of innovations in the FD lens line, including the first use of an aspherical lens element in a 35mm camera system with the release of the FD 55mm f/1.

Year of birth missing (living people) An aspheric lens or asphere (often labeled ASPH on eye pieces) is a lens whose surface profiles are not portions of a sphere or cylinder.

In photography, a lens assembly that includes an aspheric element is often called an aspherical lens.

A single aspheric lens can often replace a much more complex multi-lens system.

They are also used in combination with reflective elements (catadioptric systems) such as the aspherical Schmidt corrector plate used in the Schmidt cameras and the Schmidt–Cassegrain telescopes.

While in principle aspheric surfaces can take a wide variety of forms, aspheric lenses are often designed with surfaces of the form.

This leads to strong divergences when it comes to fitting the equation to an aspheric surface.

Small glass or plastic aspheric lenses can be made by molding, which allows cheap mass production.

In other designs, such as the Schmidt systems, the aspheric corrector plate can be made by using a vacuum to distort an optically parallel plate into a curve which is then polished "flat" on one side.

Another method for producing aspheric lenses is by depositing optical resin onto a spherical lens to form a composite lens of aspherical shape.

The non-spherical curvature of an aspheric lens can also be created by blending from a spherical into an aspherical curvature by grinding the curvatures off-axis.

Measurement technology plays a decisive role in the manufacturing of aspherical lenses.

These generate an aspherical wavefront in the target shape and thus enable the determination of deviations of the lens from the target shape in an interference image.