A lens that is not spherical in shape. The technology to create non-sperical lenses wsa invented to reduce image distortion that is a common characteristic of a spherical lens. Aspherical lenses are generally molded out of plastic or the plastic coated onto the surface of a glass lens. Comments & Discussion
Type of lens that is ground a particular way to better correct for spherical aberration. Results in better, more compact lenses.
Lenses, lensgroupes that differ from the standard spherical shape. Aspherical lenses reduce aberrations, but have high production costs. They are only appropriate to beams which are near to the axis.
These types of lenses are specially shaped to better focus the light rays entering the lens. This allows approximately 25% more light onto the sensor. This will in turn improve the overall lux level, enabling the camera to perform better at lower light levels.
A lens designed to reproduce image better by having it's edges flattened so that it is not a perfect sphere, hence: "a" [not] "spherical" [sphere].
A lens that has an aspherical surface. It is harder and more expensive to manufacture, but it offers certain advantages over a normal spherical lens.
A lens whose edges have been flattened so that it is not a perfect sphere, produces a superior image.
A lens with a curved, non-spherical surface. Used to reduce aberrations and achieve a more compact lens size. With a spherical lens, rays travelling from the lens periphery create the image before the ideal focal point and give a blurred image centre. With an aspherical lens, even the rays travelling from the lens periphery converge at the ideal focal point, thus producing a sharp image.
These lenses do not have spherical curvatures. Bimorph Composed of two thin films with different mechanical characteristics layered together.
A lens designed with a non spherical shape so that it refracts the light passing through it to either lower the lens aperture so that it passes more light or decrease barrel distortion on wide angle lenses.
A lens which one or more of the elements have a non-spherical surface. Aspherical surfaces are shaped to reduce the spherical and other aberrations.