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Canon XH Series HDV Camcorders
Canon XH G1S / G1 (with SDI), Canon XH A1S / A1 (without SDI).


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Old February 8th, 2007, 04:09 PM   #1
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Shutter Speed Below Frame Rate

The A1 (and probably other camcorders) allow you to set the shutter speed slower than the frame rate. How is this possible? For example, if I open the shutter for 1/6 of a second, 5 frames of video are captured while the shutter is open, therefore, each frame was not exposed for 1/6 of a second. It seems like the frame rate is as slow as the shutter could effectively operate.

Thanks for helping me understand this.
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Old February 8th, 2007, 05:02 PM   #2
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It's all electronic process. In your example, camera allows to accumulate images on sensors for 1/6 second just like photo cameras do, then closes electronic shutter and generates 5 identical frames based on accumulated image. The process is repeated 6 times per second resulting with 6 images sent out in stream of 30 frames.
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Old February 8th, 2007, 05:22 PM   #3
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Right, those slow shutter speeds are electronically created. There's nothing "mechanical" about them.
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