Some timers offer it as an option; I know some photographers who have been able to rig their own, DIY. It's convenient though not as necessary for those who use a single long exposure rather than a cumulative exposure from a number of shorter exposures, e.g., 3 seconds times 8.
After decades of using a enlarging Time-O-Lite, I got the Zone VI-provided footswitch (apparently called momentary, requiring just a tap to start the timing) when I bought the compensating timer. Recently, I had to sort through some specifications, re: type of connector, wires needed, open or closed, for the friend who is building the LED head for my D2.
I'm curious how others work in this respect.
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