Instructions: Lets say you're using an exposure of
5 seconds and an interval between the exposures of 10.
Your total interval is therefore 15 seconds. Lets also
assume that you want your shot to be 20 seconds long
- thats 500 frames. (25 frames per second - assuming
pal video transfer - multiplied by 20 seconds).
Look at the 1 to 20 second graph. Read up from the
bottom until you hit the orange (500 frame) line and
then read across to the number of minutes - for a 15
second interval your shot will take you 125 minutes.