When pressed initiates image focusing and capture at the camera.
When shooting with Bulb the Shutter Release button can be used to start and end the exposure, or the Bulb Interval control can be used to set a time for the exposure. When the bulb interval is set to 0 the interval is disabled and the Shutter Release button must be used to end the exposure. The Shutter Release button can also be used at any time to end a bulb exposure interval.
Bulb shooting also requires that the shot count be set to 1; this is done automatically when the capture is initiated.
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