Archived posting to the
Leica Users Group, 2006/02/09
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Subject: Digital ISO, was Re: [Leica] I have given up
From: ericm at pobox.com (Eric)
Date: Thu Feb 9 11:00:38 2006
References: <22776246.1139338750534.JavaMail.root@elwamui-milano.atl.sa.earthlink.net> <43E90565.5000507@adrenaline.com><402DA9F8-41AF-4EBC-9F27-17C48EFFCF4D@btinternet.com> <43E9A976.6060300@adrenaline.com> <00ce01c62ccf$416fb490$af7c8081@lse.ualberta.ca> <43EA567B.2010907@adrenaline.com> <C49EF8B0-D4B4-4E4C-A079-6EE9E492D5B5@openhealth.org>
Jonathan:
>In digital one can likewise underexpose until the image becomes
>background noise. 5 stops up from this gives an "ISO" for which a
>Zone 0 is background noise (pure black in the digital world).
That's making the assumption that digital has exactly 10 stops from pure
black to pure white. I'd say that assuming digital will behave exactly like
a negative is a faulty assumption, and comparing results from Canon vs.
Leica based on that is going to be a meaningless comparison.
--
Eric
http://canid.com/
Replies:
Reply from jonathan at openhealth.org (Jonathan Borden) (Digital ISO, was Re: [Leica] I have given up)
In reply to:
Message from feli2 at earthlink.net (feli) ([Leica] I have given up)
Message from scott at adrenaline.com (Scott McLoughlin) ([Leica] I have given up)
Message from Frank.Dernie at btinternet.com (Frank Dernie) ([Leica] I have given up)
Message from scott at adrenaline.com (Scott McLoughlin) ([Leica] I have given up)
Message from tim at kairosphoto.com (Tim Atherton) ([Leica] I have given up)
Message from scott at adrenaline.com (Scott McLoughlin) ([Leica] I have given up)
Message from jonathan at openhealth.org (Jonathan Borden) (Digital ISO, was Re: [Leica] I have given up)