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A digital single-lens reflex camera (digital SLR or DSLR) is a digital camera that combines the optics and mechanisms of a single-lens reflex camera with a solid-state image sensor and digitally records the images from the sensor. The reflex design scheme is the primary difference between a DSLR and other digital cameras.
DXOMARK is a commercial website described as "an independent benchmark that scientifically assesses smartphones, lenses and cameras". [2] [3] Founded in 2008, DXOMARK was originally owned by DxO Labs, [4] a French engineering and consulting company, which is headquartered in Boulogne-Billancourt, Paris, France.
A digital camera, also called a digicam, [1] is a camera that captures photographs in digital memory. Most cameras produced today are digital, ...
Digital Photography Review, also known as DPReview, is a website about digital cameras and digital photography, established in November 1998. [4] The website provides comprehensive reviews of digital cameras, [4] lenses and accessories, buying guides, [4] user reviews, [4] and forums for individual cameras, as well as general photography forums.
However, the huge demand for complex digital cameras at competitive prices has often caused manufacturing shortcuts, evidenced by a large increase in customer complaints over camera malfunctions, high parts prices, and short service life. Some digital cameras offer only a 90-day warranty. Since 2003, digital cameras have outsold film cameras. [32]
Foucault test setup to measure a mirror. The Foucault knife-edge test is an optical test to accurately measure the shape of concave curved mirrors. It is commonly used by amateur telescope makers for figuring primary mirrors in reflecting telescopes. It uses a relatively simple, inexpensive apparatus compared to other testing techniques.
The sensitivity of a (digital or film) imaging system is typically described in the terms of the signal level that yields a threshold level of SNR. Industry standards define sensitivity in terms of the ISO film speed equivalent, using SNR thresholds (at average scene luminance) of 40:1 for "excellent" image quality and 10:1 for "acceptable ...
The system provides a standard that permits interoperability of digital cameras and lenses made by different manufacturers. Proponents describe it as an open standard, but companies may use it only under a non-disclosure agreement. [2] Unlike older single-lens reflex (SLR) systems, Four Thirds was designed from the start for digital cameras.