Hi Jez
>OK Ian - what's the effective guide number of a T20 plus a T32? :-)
I'm not that Ian but it would be 42, I normally work it out as aprox's, ie
a T32 + T32 = (32/2)+32 = 48
a T32 +T20 = (20/2)+32 = 42
I always divide the lowest powered light source by 2.
This isnt accurate but normally good enough for field work if you are
using negative film 100ASA and up.
Cheers
Ian Manners
http://www.comkal.net/photo/
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