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As chromatic aberration is complex (due to its relationship to focal length, etc.) some camera manufacturers employ lens-specific chromatic aberration appearance minimization techniques. Almost every major camera manufacturer enables some form of chromatic aberration correction, both in-camera and via their proprietary software.
Variable focal lengths (18–35 mm) Zoom which maintains focus as the focal length changes (parfocal lens) Aspherical lens with fast and large lens aperture; Servomotor control of zoom, focus and aperture via remote control handles; Built-in image stabilization; Multi-group zoom lens system [2] [3]
Noisy text is text with differences between the surface form of a coded representation of the text and the intended, correct, or original text. [1] The noise may be due to typographic errors or colloquialisms always present in natural language and usually lowers the data quality in a way that makes the text less accessible to automated processing by computers, including natural language ...
As the focal length required to capture a scene at a specific angle of view is roughly proportional to the width of the sensor, given an f-number the amount of light collected is roughly proportional to the area of the sensor, resulting in a better signal-to-noise ratio for larger sensors. With constant aperture diameters, the amount of light ...
Another type of normalization is based on a measure of loudness, wherein the gain is changed to bring the average loudness to a target level. This average may be approximate, such as a simple measurement of average power (e.g. RMS), or more accurate, such as a measure that addresses human perception e.g. that defined by EBU R128 and offered by ReplayGain, Sound Check and GoldWave.
The focal point F and focal length f of a positive (convex) lens, a negative (concave) lens, a concave mirror, and a convex mirror.. The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power.
SNR is sometimes quantified in decibels (dB) of signal power relative to noise power, though in the imaging field the concept of "power" is sometimes taken to be the power of a voltage signal proportional to optical power; so a 20 dB SNR may mean either 10:1 or 100:1 optical power, depending on which definition is in use.
The crop factor is sometimes referred to as the focal length multiplier ("Film") since multiplying a lens focal length by the crop factor gives the focal length of a lens that would yield the same field of view if used on the reference format. For example, a lens with a 50 mm focal length on an imaging area with a crop factor of 1.6 with ...