High Speed Video Test, Canon Powershot ELPH 110 HS / IXUS 125, 240 fps
To view stop-action single-frame advance on Vimeo press the play-pause button as fast as possible.
The 110 HS uses an automatic exposure control in high speed video mode. It uses Canon "Evaluative" light metering. It is difficult to know what shutter speed under various lighting conditions will result without testing. The fastest shutter speed listed in the specs is 1/2000 sec but it is not clear what shutter speed is achieved in high speed video mode.
The purpose of this test was to use direct sunlight and a telephoto lens setting and observe the shutter speed/motion blur that the automatic exposure control might select for the tennis serve. Some sky was viewed so that the AEC might possibly use a faster shutter. ? Bright sunlight and a lens aperture of f# 5.9 were used. (the most telephoto lens setting).
This is a telephoto overall view up showing the motion blur on the racket and ball. The background for the ball is the sky then trees. 11 AM direct sunlight (see shadows for direction). From the ball streak the motion blur appears to be considerable.
When the length of the motion blur is compared to how far the ball moves forward in one frame, the motion blur is about equal to the distance traveled advanced between frames. That would indicate that the shutter speed is roughly equal to the time between frames, 1/240 sec or a slightly shorter time. Focus is not perfect so this experiment could be repeated with a larger image of the ball to get a more accurate estimate of shutter speed.
The sensor resolution at 240 fps is 320 X 240. The Vimeo compressed video loses a little image quality relative to the original video file.
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