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Amazon stated that "the maximum bandwidth of a Sidewalk Bridge to the Sidewalk server is 80 Kbps, which is about 1/40th [2.5%] of the bandwidth used to stream a typical high definition video." [ 18 ] This comparison is misleading for ADSL connections with upstream bandwidth more limited than downstream bandwidth: 80 Kbps approaches 20% of the ...
The space–bandwidth product (SBP) is a measure of the information-carrying capacity of an optical system. [ 1 ] [ 2 ] It is the product of the spatial extent (size) of the system and the bandwidth (frequency range) over which it operates.
Guide number distances are always measured from the flash device to the subject; if the flash device is detached from the camera, the position of the camera is irrelevant. Furthermore, unless a flash device has an automatic zoom feature that follows the setting of a camera's zoom lens, guide numbers do not vary with the focal length of lenses.
Bandwidth test software is used to determine the maximum bandwidth of a network or internet connection. It is typically undertaken by attempting to download or upload the maximum amount of data in a certain period of time, or a certain amount of data in the minimum amount of time.
E.g. a microscope typically magnifies everything 10 to 100-fold, and a reflex camera will generally demagnify objects at a distance of 5 meter by a factor of 100 to 200. The resolution of a digital imaging device is not only limited by the optics, but also by the number of pixels, more in particular by their separation distance.
= (where distance and wavelength are in the same units) When substituted into the link budget equation above, the result is the logarithmic form of the Friis transmission equation . In some cases, it is convenient to consider the loss due to distance and wavelength separately, but in that case, it is important to keep track of which units ...
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The image sensor format of a digital camera determines the angle of view of a particular lens when used with a particular sensor. Because the image sensors in many digital cameras are smaller than the 24 mm × 36 mm image area of full-frame 35 mm cameras, a lens of a given focal length gives a narrower field of view in such cameras.