What happens if I select the wrong SH UTTER speed?

Trial-and-error is part of this project, so it’s inevitable that you’ll pick the wrong speed sometimes

■ Shutter speed is the key to this technique: it needs to be slow enough to capture the trails, but not so slow that they blow out completely. As can be seen here, the difference between too quick and too slow is obvious. The perfect shutter speed allows you to complete the motion, which is why using the self-timer and having someone to help you is important.