[Lee L]

Slight typo? 1/125 sec. is 8 milliseconds. 32 times this is 256 milliseconds. Mathematically, it would take 500 exposures of 1/125 to make 4 seconds, without allowance for reciprocity failure. It would of course also be possible to make multiple exposures, some at 1/125, some at slower speeds.

Regards,

David

Sorry, it was late and I made a mistake. The indicated exposure was 1/4 second, not 4 seconds. So Les did his math correctly and I should have been asleep in bed rather than at the keyboard. Thanks for the correction.

There are two other waterfall photos in Les' book. One used a single 4 second exposure and the other used 20 one second exposures for an indicated 20 second exposure.

Lee