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Re: [OM] Difference in film reflectance

Subject: Re: [OM] Difference in film reflectance
From: "Bruce Appelbaum" <brucea@xxxxxxxxxxx>
Date: Mon, 16 Oct 2000 13:29:10 -0400
Polaslide film cannot be used for OTF metering because of its extremely high
reflectivity.


end

Regards

Bruce Appelbaum
Yorktown Heights, New York


----- Original Message -----
From: "Dan Lau" <dlau@xxxxxxxxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Monday, October 16, 2000 12:12 PM
Subject: [OM] Difference in film reflectance


> I am wondering if there is any difference in the amount
> of light reflected in exposed film vs. un-exposed film.
> For example, when testing one of the OTF models (OM2 to
> OM4(T(i))), does it matter what type of film is put in
> the film chamber during the test.  In my thinking, there
> are (at least) the following possibilities:
>   Un-exposed film [a fresh roll every time, expensive]
>   Exposed (but un-processed) film [if I use the same
>     roll of film to test several bodies, this is what
>     I'll end up with]
>   Processed un-exposed film [this is just clear film]
>   Processed exposed film [in this case, does it matter
>     what is on the film?]
>
> So does it matter which type of film I use to check out
> the OTF meter accuracy of an unknown body?  Thanks.
>
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