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[OM] Re: Something I hate to admit in public...

Subject: [OM] Re: Something I hate to admit in public...
From: Doug Smith <dhsmith@xxxxxxxxxxxxxx>
Date: Sun, 4 Feb 2007 22:43:47 -0500
On Sun February 4 2007 9:54 pm, Chuck Norcutt wrote:
> Here's something that will give you the time most of the time.
>
> Get out your flash meter.  Without reference to the manufacturer's lies
> about guide number, measure the output at 11 feet (or any distance of
> your choice).  To pick a number, let's say the result is f/8 at ISO 100
> for a true guide number of 88 feet.  Now, whenever you need to do a
> quick flash shot you set the lens at f/8 and position yourself 11 feet
> from the subject.  Then zoom your zoom lens for the proper framing
> instead of zooming with your feet.  Proper exposure 100% of the time
> assuming you get reasonably adept at guessing how far is 11 feet.
>
> But why 11 feet you say?  Yes, there is method to the madness.  Does 11
> sound like an f/stop?  Should you be suddenly forced to choose something
> closer or further you might recognize that, if 11 sounds like an f/stop
> then perhaps 8 feet and 16 feet will sound like f/stops too.  If you
> must be closer then make it 8 feet instead of 11 and close down one
> stop.  If you must be further then make it 16 feet and open up one stop.
>
> Those of a metric persuasion might play the same game with 4 meters as a
> baseline and use options of 2.8 meters and 5.6 meters on either side of
> 4.  Or, choose whatever base distance value you like and determine the
> other distances as (base / 1.4) or (base x 1.4).
>
> Tape a little "cheat sheet" to the back of your flash.
>
> Chuck Norcutt


I like it.  Do flashe guide numbers vary between examples of the same flash. I 
know that battery charge influences ecycle time, but I assume that unless the 
are almost dead they don't change the guide number.

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