Nikon D300 User Manual page 628

place a paper document on a scanner and press the scan
button, you'll see the little row of light under the glass travel
from the top of the document to the bottom as it records one
line at a time. At the end of the scan, there is a copy of the
document in your computer's memory that can be saved to
the hard drive. You usually put the scanner's lid down on a
paper document to hold it flat and keep it from moving.
Now, let me ask you to imagine something. What if you were
scanning a paper document on your desktop scanner and
halfway through the scan you moved the paper a little? The
top part of the scan would look normal, since it was already
captured by the scanner's sensor, but the bottom part of the
scan would be at a different angle than the top part. You
could say that it is "skewed" away from the original angle.
This is an example of the skew issue we mentioned before.
Or, what if you grabbed the paper and rotated it back and
forth all the way through the entire scan? The final scanned
document would look like a series of zigzags, with some parts
at one angle and other parts at a different angle. The end
result would not be very nice, would it? This is an example of
the wobble issue I mentioned above.
The D300S records video in a similar manner, except it is
much faster than a scanner. It records a frame of video in 1/24
second, or 24 fps. Since the Nikon D300S scans the image the
lens sees at 24 fps, there's not a problem in most cases. Most
movement is too slow to be zigzagged (wobble) or off-angled
(skew).
Skew and wobble become especially evident when a person is
walking and videoing at the same time. The subject of the
video is moving, and the person taking the video is moving
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