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The company sells more than 2,000 types of prescription glasses and sunglasses but does not sell contact lenses. Zenni created theme glasses through collaborations with professional gamers, sportspeople, the designer Iris Apfel and the actress Rashida Jones.
Eye care professionals use prism correction as a component of some eyeglass prescriptions. A lens which includes some amount of prism correction will displace the viewed image horizontally, vertically, or a combination of both directions. The most common application for this is the treatment of strabismus.
A fast lens speed is desirable in taking pictures in dim light, for stability with long telephoto lenses, and for controlling depth of field and bokeh, especially in portrait photography, as well as for sports photography and photojournalism.
An optical prism is a transparent optical element with flat, polished surfaces that are designed to refract light. At least one surface must be angled — elements with two parallel surfaces are not prisms. The most familiar type of optical prism is the triangular prism, which has a triangular base and rectangular sides.
It can offer good results up to f /1.4 with a wide field of view, and has sometimes been made at f / 1.0. The design is presently used in inexpensive-but-high-quality fast lenses such as the Canon EF 50mm f / 1.8 and Nikon 50 mm f / 1.8D AF Nikkor.
Lens antennas can be classified into two types: delay lens antennas in which the microwaves travel slower in the lens material than in air, and fast lens antennas in which the microwaves travel faster in the lens material.
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