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Figure 71: Camera shot signal generation
Before reaching the parallel port output the correct waveform to control the shutter
button release is generated. The shutter button is typically hold down for 0.5 s for frame
rate ≥ 1. Greater frame rates could be reached simply keeping always down the shutter
buttons; the camera enters the continuous driving mode and frame rates up to 3.5 fps can
be achieved. At the highest frame rate images must be saved into the onboard Secure
Digital memory card because the measurements reveals that the USB connection has a
maximum transfer rate of about 52 Mbit/s (corresponding to about 0.5 fps); the EOS
450D connections panel is shown in Figure 72. A 40 ms delay must be considered
between signal generation and effective shutter movement.
Figure 72: Canon EOS 450 remote connections panel
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