Originally Posted by
Doremus Scudder
Ian,
Your math is correct. The way xkaes figures, one comes up with 32 exposures, but the difference is trivial. In this case, Jac is wrong (uncharacteristically). You need a lot more than five exposures at 1/125 to equal 1/4 sec. Think of it this way: 1/4 second is 250 milliseconds; 1/125 second is 8 milliseconds. Divide 250 by 8 to find how many exposures you need. Answer: 31.25.
However, keep in mind that there is such a thing as the intermittency effect, which basically states that many short exposures do not exactly equal one long exposure. If I were in your place, I would use 40 or more exposures.
FWIW, I use cumulative exposures to make up one total exposure all the time, although usually only 4-10 different exposures. It's a great way to stop wind, keep passers-by and cars out of your shots and get rid of blinking lights.
Best,
Doremus
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