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Re: [OM] Re: Film Reflectance Variance

Subject: Re: [OM] Re: Film Reflectance Variance
From: Joel Wilcox <jowilcox@xxxxxxxxxxxxxxxxxxx>
Date: Wed, 23 Jun 1999 08:48:50 -0500
Cc: tom@xxxxxx
At 10:51 PM 6/22/99 -0400, you wrote:
>I find it difficult to interpret the results, since we don't know what 
>reflectance the OTF sensor is calibrated to.  What I'd like to see is 
>the ISO rating we should set for each film to give comparable 
>(correct?) results for OTF exposures. For example, 
>
>Film                           Reflected       Nominal To use
>Kodak Gold 100         f/5,6.2          100             100
>Sensia II 200          f/5,6.2  200             200
>Agfa RSX 50            f/5,6.3   50              50     
>Kodak Elite II 100     f/5,6.4  100              80
>T Max 100                      f/8,0.3  100             200
>Agfacolor HDC 100      f/8,0.3  100             200
>Kodak Gold 800                 f/8,0.5  800            1800    
>Kodak Gold 200                 f/8,0.0  200             320
>Kodak Gold 400                 f/8,0.1  400             800
>Agfa Scala             f/8,0.7  100             250 
>Fuji Velvia            f/5,6.7   50              64
>Kodak Royal Gold 25    f/8,0.2   25              50
>
>My reasoning is that I assume that the exposure for Gold 100 is 
>correct, and if the reading's higher, you should set the ISO on the 
>camera to higher so the lens will stop down more.
>
>Of course, if you switch back to using manual measurements....
>
>Tom
>

Hi Tom,

I figure the issue is not how to interpret these data, but how can I make a
laser test out of it <G>.

It does sort of spur me to do those tests we all should do anyway:  setting
up a shot with neutral (Zone V) values plus gray card and shooting brackets
using the ASA dial.  Do this with slide film and then apply analogously for
the print films with similar values.

Trouble is I'm happy with Provia at 100, Reala at 100, etc.  It's really a
nuisance when I'm happy.  I just shoot and no important testing gets done ;-)

Joel Wilcox
Iowa City, Iowa USA

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