Manually adjusting flash intensity/duration ... how?
AP 5 May 2012 included a fascinating article about a chap called Tobias Brauning who has produced some amazing shots of coloured water droplets.
Part of his techique is to manually control the intensity/duration of his flash lighting .. he likes to expose his shots with a flash duration of at least 1/15,000sec.
Using a 5D MkII & 580EX II flashgun, the only way I can change the flash intensity/duration is to alter the EV by a maximum factor of +/- 3 stops.
How does one manually set flash intensity/duration with my set up, or is this where my thinking hits a brick wall, because what I really require is some pretty clever electronic stroboscopic equipment?
I know you believe you understand what you thought I said, but I'm not sure you realise what you heard is not what I meant