As a camera system's depth of field is greater for small image formats and is greater for lenses with a large f-number (small aperture), the systems used in webcams have a sufficiently large depth of field that the use of a fixed-focus lens does not impact image sharpness to a great extent.
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Most consumer webcams are capable of providing VGA-resolution video at a frame rate of 30 frames per second.
Many newer devices can produce video in multi-megapixel resolutions, and a few can run at high frame rates such as the Play Station Eye, which can produce 320×240 video at 120 frames per second.
Researchers claim that this method is accurate to ±5 bpm.