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[OM] Re: Film Reflectance Variance

Subject: [OM] Re: Film Reflectance Variance
From: "Tom Trottier" <infoanim@xxxxxx>
Date: Tue, 22 Jun 1999 22:51:49 -0400
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


> Date: Mon, 21 Jun 1999 08:29:36 -0500
> From: Joel Wilcox <jowilcox@xxxxxxxxxxxxxxxxxxx>
> Subject: [OM] Re: Film Reflectance Variance (was "OM4 behavior - oops,
> nevermind")
> 
> At 05:25 PM 6/21/99 +1000, you wrote:
> >> However, I do have a question for the OM wizards. Does all film
> >> available for 35mm have the same reflectance characteristics? It seems
> >> like a rather large leap of faith for the OM designers to base an
> >> exposure on that assumption.
> >
> >Big question mate. What's the light reflectance of unexposed film? We had
> >some threads about this a while ago. It seems Olympus set it up for
> >Kodachrome 64 (which fortunately I use). But there are differences
> >between films and between different batches of fthe same film.
> >
> >Hey, just use K64!
> >
> >Foxy
> >
> 
> Here's Gary Reese's post on the variation among modern films:
> 
>  http://zuiko.sls.bc.ca/swright/archives/1998/msg07676.html
> 
> The results briefly:
> 
> "Results:
> Grey card: f/5,6.9
> Kodak Gold 100 f/5,6.2
> Sensia II 200 f/5,6.2
> Agfa RSX 50 f/5,6.3
> Kodak Elite II 100 f/5,6.4
> T Max 100 f/8,0.3
> Agfacolor HDC 100 f/8,0.3
> Kodak Gold 800 f/8,0.5
> Kodak Gold 200 f/8,0.0
> Kodak Gold 400 f/8,0.1
> Agfa Scala f/8,0.7
> Fuji Velvia f/5,6.7
> Kodak Royal Gold 25 f/8,0.2"
> 
> See the original post for specifics of testing, etc.
> 
> 
> Joel Wilcox
> Iowa City, Iowa USA
------------------
From: Tom Trottier, President, ACT Productions Inc.
infoanim@xxxxxx                   http://www.act.ca
+1 613 594-4829                 fax +1 613 594-8944
199 Holmwood Ave,  Ottawa, Ontario, Canada  K1S 2P3
"Make it as simple as possible, but no simpler" - Einstein

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