I want to capture a signal on an oscilloscope screen, but I do not know how long time the interesting signal is seen beforehand. So my thinking is that I use bulb-mode on the camera and control the remote shutter from my Arduino. Time will be about 200ms to 2 seconds, but I would like to stop as early as possible to avoid exposure of unrelated signals on the oscilloscope.
My question is how much time I can expect from press to exposure starts and how long time after release exposure ends. Are the numbers somewhat stable? Does it help or hurt if I start by having live-view active?