Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!uunet!mstan!jordan
From: jordan@Morgan.COM (Jordan Hayes)
Newsgroups: comp.graphics
Subject: Re: photographing screens
Keywords: film reciprocity error
Message-ID: <568@s5.Morgan.COM>
Date: 4 Dec 89 15:51:19 GMT
References: <264@fe2o3.UUCP>
Reply-To: jordan@Morgan.COM (Jordan Hayes)
Distribution: na
Organization: Morgan Stanley and Co., NY, NY
Lines: 12

Rusty Haddock asks:

	How 'bout checking the reciprocity correction for ``long'' (<
	1/15-sec) exposures?

Reciprocity tends to break down (``reciprocity failure'') at much
longer times than those being reccomended for this kind of work.
Especially for slower films.  Ektachrome 100, for instance, would
become a problem at around 4 seconds of exposure; at that point, i'd
rather worry about vibration from your officemate slamming the door.

/jordan