Xref: utzoo sci.electronics:4818 rec.photo:4350
Path: utzoo!attcan!uunet!husc6!ogccse!verdix!sequent!brian
From: brian@sequent.UUCP (Brian Godfrey)
Newsgroups: sci.electronics,rec.photo
Subject: Re: Flashbulbs
Message-ID: <10095@sequent.UUCP>
Date: 23 Jan 89 05:03:16 GMT
Reply-To: brian@crg1.UUCP (Brian Godfrey)
Organization: Sequent Computer Systems, Inc
Lines: 16

>Pardon my ignorance, but... doesn't this mean that shutter speed is
>essentially irrelevant for a flash picture taken using an electronic
>flash?  If so, how does one control the exposure?

   Shutter speed is relevent to the extent that the shutter must be all
the way open before the flash is triggered. (The question was in respect
to electronic flash, contrary to the subject line, above.)
   You can control the exposure with the aperture setting. Some flash
units allow you to control the flash power. You can change the distance
the light from the flash has to travel (inverse square law). Autoflash
and TTL autoflash control exposure by limiting flash duration.
-- 

--Brian M. Godfrey
  Sequent Computer Systems Inc.
  !tektronix!sequent!brian