Hi Rainer, and Piers :)
><<a T32 + T32 = (32/2)+32 = 48
><<a T32 +T20 = (20/2)+32 = 42
>
>Sorry that I feel like correcting you, but the official formula is:
Thats ok, as I did say in the email, not accurate but does the job
for field work :-)
>Take square root of the sum of the squared guide numbers.
I'm getting to old to do maths in my head now, which is why I do
the rough way, and to be honest, I normally take a few more GN
off for good luck, call it experience but also bearing in mind I am
only talking about T20, T32's here.
>That gives 45 for the double 32, but 38 for 20 + 32. Not a big difference,
>but it applies easily to multiple setups :
>two 32 + one 20 = 49, how calculate your way?
I'd use your way here, as the error margin is increasing to much.
Mind you, I cant see myself using 2 x T32's and a T20 in the field.
I'd also definitly stick with TTL for anything more than 2 flashs unless
it was a studio setup with time on my hands.
Cheers
Ian Manners
http://www.comkal.net/photo/
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