So, how does that guide number thingie work again; something divided by
something gives your something?
Gregg
Who only used a guide number except to compare flash output before 1975!
(in standard American English) Lex wrote:
> Finally, regarding flash, if your young charge is really interested in
> pursuing roots-level 35mm SLR photography, learning guide numbers is a
> necessity. And really not all that difficult. So the OM-1 with any old
> flash will do. Then he'll appreciate the advantages of auto-flash and,
> finally, the subtleties of TTL flash.
>
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