I used to design digital cameras so maybe I can provide a little
insite. The imager is exposed in a sequential fashion moving top to
bottom (or vise versa). The length of the expose is granular to the
number of scan line times that the pixels are allowed to soak up
protons before being dumped out. The brighter the scene is (worst
case being a sunny day) the narrower the electronic horizontal shutter
is and the better it will be able to stop motion. So on a sunny day
with a propeller you are getting a picture of the propeller at
slightly different times (hence the bent appearance) with a sharp
enough picture to see the distortion. A way around this is to force
the camera to use a longer exposure and make the propeller blur into
the form that people are used to looking at. You could do this by
putting a neutral density filter in front of the lense, thus making
the AGC crank in a longer exposure.

An interesting anecdote about the horizontal shutter: I was told that
the reason that old cartoon showed race cars with the wheels shaped
like ovals when they were going fast was because people had seen
photographs of race cars going by and the mechanical shutter had put
this effect into the image.



"Ron Webb" wrote in message ...
An interesting effect with the prop. I suppose it is some digital version of
the frame rate vs prop RPM stroboscope effect that we are used to seeing,
but modified because of the digital camera thing.

Anybody got a better explaination?


Ron Webb



" jls" wrote in message
...
Neat. And good resolution for a $125 camera too:

http://www.bowersflybaby.com/pix/video.html