Newbie question: if I want a 3 second exposure but my shutter only has a maximum controlled speed of 1 second (with bulb as the next setting), how do I accurate ly time the exposure? The difference between 1 and 2 seconds is obviously a lot bigger in percentage terms than the difference between 14 and 15 seconds, so thi s is accuracy is more relevant at faster speeds, so how do you go about getting an accurate 2 or 3 second exposure?
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