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Oled (organic light emitting diode)
| Lens Glossary |
An advanced form of led that does not require backlighting, the oled displays denser blacks and higher contrast compared to standard lcds, and can be manufactured with thinner profiles than standard lcds. oled displays have small red, green, and blue leds—as opposed to lcd screens, which have red, green, and blue color filters over a backlight that twist shut to block light.
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Backlighting, английский
- Viewing or photographing an object by placing it between a light source and
- From camera position, light that comes from behind the subject. usually, a backlit main subject will be underexposed unless the metering system is set to read selectively off the subject, or exposure on a center-weighted meter is compensated accordingly. see also fill-flash. extreme backlighting can be exploited to create silhouettes.
- The illumination of an object from the rear. back lining 1. a thin wood strip which lines a window casing, next to the wall and opposite the pulley stile, and provides a smooth surface for the working of the weighted sash; also called back boxing or a back jamb. 2. that piece of framing forming the back recess for boxing shutters.
- Подсветка сзади
Manufactured, английский
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Aspherical surface, английский
An aspherical lens surface possesses more than one radius of curvature, which allows for the correction of lens aberrations that are common in simpler lens designs. sharper definition toward the edges of an image is the most common benefit of a lens containing aspheric elements. for more on this subject, see the explora article, “optical anomalies and lens corrections explained.”
Focal length magnifier, английский
Also known as magnification factor or crop factor, this term is used to describe the angle of view (aov) of a lens used on a dslr in relation to how it would appear on a full-frame 35mm camera. as an example, compact dslrs contain sensors that are about 50% smaller than a standard 35mm frame. as a result, the effective focal length and aov of a 50mm lens on a compact dslr would be reduced, or cropped to the equivalent of a 75mm lens. canon eos rebels and other compact canon dslrs have a 1.6x magnification factor, which would make a 50mm lens effectively an 80mm lens. for more on this subject, see the eplora article, “understanding crop factor.”
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