The camera will record clips up to five minutes long at 1280 x 720 pixels (20 minutes at the smaller movie sizes) before recording is stopped to give the image sensor an opportunity to cool. The file size for a typical five minute, 1280 x 720 pixel clip is roughly 600MB. There's no control over the JPEG compression level. A mono mic on the front of the camera picks up audio. Sound quality, owing to a combination of the mic component and internal audio processing, is likely to be so-so. There is no provision for plugging in an external microphone. Other than turning the mic off, there are no audio options such as manual level adjustment or wind filtering.
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http://canonbite.blogspot.com/2011/06/nikon-introduces-d5000-digital-slr-with.html
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