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From: ark@alice.UUCP (Andrew Koenig)
Newsgroups: sci.electronics,rec.photo
Subject: Re: Flashbulbs
Message-ID: <8805@alice.UUCP>
Date: 20 Jan 89 18:43:55 GMT
References: <9844@sequent.UUCP> <1818@maccs.McMaster.CA>
Organization: AT&T Bell Laboratories, Liberty Corner NJ
Lines: 17

In article <1818@maccs.McMaster.CA>, nusip@maccs.McMaster.CA (Mike Borza) writes:

> 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?

Correct -- shutter speed is irrelevant for pictures taken
with electronic flash.

You can vary three things to control exposure: aperture, distance
from flash to subject, and flash intensity.  Some flash units do
not allow the intensity to be varied.  Others have sensors that
measure the amount of light reflected from the subject and adjust
the intensity appropriately.
-- 
				--Andrew Koenig
				  ark@europa.att.com