Re: Film Spectral Sensitivity/Transmission Question.

[P3D John Ohrt <johrt@xxxxxxx>]

P3D Jeremy Hinton wrote:
> 
> Previously posted to T3D.... but while the application
> is for stereo, the 'tech' bit is not specifically so. Perhaps
> someone on P3D knows where to get this data?
> 
> Subject: Film Spectral Sensitivity/Transmission Question.
> 
> Is it possible to get hold of data on the spectral
> sensitivity of each light sensitive component of
> slide film?

I think I have seen spectral sensitivity for some Kodak products an
their web site.

www.kodak.com

> 
> Is the spectral sensitivity the same as the spectral
> transmission when developed?

Read the fine print.  It is likely only data from one particular
development procedure.

> 
> Is it possible to get hold of data on the spectral
> transmission of each colour component of slide film?

If you have the overall performance, why would one care?

> 
> I am particularly interested in Fuji Sensia 100, but
> any input would help.

I understand that Fuji has a compucharge presence.  I have yet to
discover a website with film data, something most of their competitors
provide!  If you don't have compucharge access, there is snail mail. 
Frankly, fuji goes out of their way tro obfuscate their products, IMO. 
My wife is a loyal fuji user.


> I am looking for this information because I have been
> using spectral data for electronic displays to select
> filters to 'optimise' anaglyphs. When the requirement
> is to maximise the transmission and eradicate obvious
> ghosting, this approach works well.  The results of
> a simple download to film, however, are disappointing.
> It is easy to seperate the colour components of a display
> (because you can give it a single R,G,or B input) and
> measure them independently.
> Film is more tricky.

Actually, there aren't three colours, just many emmission lines
approximating three colours.  I wonder if colour chemistry is
sufficiently stable to precisely match the display.  Maybe you can like
with good enough.  Matching the filters is assumed in anaglyph work, but
from what I've heard here there is no single standard.  Nothing beats a
collection of glasses, however dumb that may sound.

Data to play with.  Try the Kodak site under products and then films and
start calling up spec sheets.  You will likely have to print out the
data and then take the data points from a graph.

Good Luck!

--
John Ohrt,  Regina, SK, Canada
johrt@xxxxxxx


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