lexjenkins@xxxxxxxxxxx writes:
Very good advice Lex, IMO, since we all lose the instructions, don't we? I've
also been writing the guide # on the back of the flash, (since I also use
other brands besides Olympus) but you'll need something like a paint marker
since all the flashes are black. No problem for me, since my wife has this
huge arts and crafts storage box in the same closet as my camera gear.
Regards,
George S.
> Let's turn it around and say you're trying to calculate the unknown guide
> number of a flash that has a scale for determining appropriate f/stops
based
>
> on ASA and distance.
>
> Set the ASA marker to 100. Look at the 10 foot mark. The f/stop
> corresponding to the 10 foot mark, multiplied by 10, tells you the
> approximate GN. In the case of my Canon AB-46 flash, the 10 foot mark is
> between f/8 and f/11. So the GN is approx. 95.
>
> Help a bit?
>
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