Re: [Leica] OT Flash guide numbers and they work? OT

[Amilcar de Oliveira <amilcar@domain.com.br>]

After all the answers, about all that needs to be added is that the
guide number is computed assuming the picture will be taken within a
room. Wall reflections are built in the number; if you're working on the
open, you may need to open up the aperture. Another thing is that if
you're doing macro work, flash distances are measured from the back of
the hot shoe (nearest place to the focal plane, where distance markings
on the lens are measured from)and not from the front of the reflector.
This difference is trivial at normal distances. This I found by trial
and painful error...

Cheers,
Amilcar



Ted Grant wrote:
> 
> Hi folks,
> 
> This is right off the wall ancient need to learn it over again.
> 
> A chap down the street called and asked me how to use the guide number on
> the flash he has?
> 
> Well OK I thought I knew.... however that was 45 years ago when the flash of
> the day had guide numbers. Even then I had trouble figuring that stuff out,
> then I discovered photo life was much easier when you didn't use flash and
> go available light. ;-)
> 
> Besides any flash I used over the years has always been something automatic
> no brainer thing.  So please help me with a very simple way to explain this
> guide number and how to make it work with whatever flash and camera is he
> has.
> 
> thanks guys and gals.
> ted
> 
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