Re: Data for choosing film for stereo

[Joel Alpers <joel.alpers@xxxxxxxx>]

Tom Deering wrote:
> 
> >1. The new Provia (RDPIII) has even lower grain than Velvia.
> >However, the resolving power is unchanged from the current
> >version of Provia (RDPII), which has somewhat less resolving
> >power than does Velvia.
> 
> Well, how the heck can that be?  Shouldn't there be a correlation between
> grain size and resolution?
> 

You'd think so, but it isn't as tightly related as it might
seem. One of the Ansel Adams' books (The Negative, I think) has
very large enlargements of a negative, one with larger grain
that shows better resolution than the fine-grained one. Depends
on developer, too, as some developers "eat away" at the grain,
producing finer grain but lower resolution.

Joel.