[Leica] Oyster Roast

Archived posting to the Leica Users Group, 2006/12/12

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Subject: [Leica] Oyster Roast
From: rangefinder at screengang.com (Didier Ludwig)
Date: Tue Dec 12 17:34:52 2006
References: <7.0.1.0.2.20061211122910.02609bc0@infoave.net> <8mtrn213q9ai8lj4v03b2ft4heig36ij87@4ax.com> <7.0.1.0.2.20061211194850.028c3440@infoave.net> <qpeun2lpbi45ea5oqlt68cnr9gl31ek4oh@4ax.com> <7.0.1.0.2.20061212202515.027bcdc8@infoave.net>

Eric's right. One stop means doubling the ISO number. 2 stops means double x 
double = 4x.
640 underexposed by 2 stops would mean 4x640=2560.
Didier


>>2560, by my math.  640 underexposed by one stop would be 1280.  One stop
>>less than 1280 is 2560.
>
>This makes three different formulas that have been used to determine the 
>ISO at 2 stops under with results ranging from 1280 to 2560!!  Help!  I am 
>a mathematics impaired person.  Which one is right?
>Thanks!
>Tina

In reply to: Message from images at InfoAve.Net (Tina Manley) ([Leica] Oyster Roast)
Message from ericm at pobox.com (Eric) ([Leica] Oyster Roast)
Message from images at InfoAve.Net (Tina Manley) ([Leica] Oyster Roast)
Message from ericm at pobox.com (Eric) ([Leica] Oyster Roast)
Message from images at InfoAve.Net (Tina Manley) ([Leica] Oyster Roast)