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P3D Re: slide film or neg film?

Eric Goldstein writes:

>(b) We want negative film because is has twice the contrast 
>range of slide film, roughly 6 stops versus 12 stops! 

Just curious is this characteristic of the postive/negative
nature of the film or the fact that we want slides to be
contrasty and negatives to be less contrasty?  Can slide film
be made with wider contrast range?

George Themelis


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