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Terms in this set (21)
A combination of convex and concave lenses designed to overcome optical problems, called aberrations, that result in blurred, color-distorted, or shape-distorted images.
A lens shape that is curved inward.
To come together, as in light rays passing through a convex lens.
A lens shape that is curved outward.
A camera feature that electronically crops the image to smaller dimensions, thus making it appear larger. However, this causes the image quality to deteriorate.
To be spread apart, as in light rays passing through a concave lens.
Simple lenses that can be combined to create a complete lens.
A lens with an angle of view greater that 180°. Such a lens produces a round image with considerable spherical distortion.
The effect of stray light bouncing around inside the lens housing, causing decreased contrast, or even severe "washed out" appearance that mimics overexposure.
The distance from the optical center of a lens to the point where the light rays converge (the film plane) when the lens is focused at infinity.
The common point at which converging light rays meet.
A lens that can focus more closely than a typical lens of the same focal length.
System that move the lens elements to change the angle of view without affecting the quality of the image.
Photographic elements so that they appear much larger than they are in real life.
A lens with a fixed focal length.
The bending of light rays that takes place in a lens because of the differing densities of glass and air.
A numeric expression of size relationships, such as 1:4. The numeral before the color represents the colon represents the reproduction size, or the size on film; the number after the colon represents the size of the actual object.
Small, lightweight lenses with exceptionally wide zoom ranges that extend from as wide as 24mm to as long as 840mm.
The true telephoto lens has a front-focusing design that shortens the light path, making a larger image possible at the film plane with less physical distance between the front lens element and the film. The point from which the distance to the film plane is measured to determine focal length is actually located out in the space in front of the first lens element group.
Term used to describe an image with darkened corners.
A lens with a variable focal length, allowing the photographer to change composition without physically changing lenses or position.
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