Quote Originally Posted by Michael R 1974 View Post
So I'll ask again - what is the purpose of giving less exposure? You might have a shorter print exposure time, but reduced local contrast in the shadow values in the negative - not a good thing from a Zone System perspective.
Why not just print through any density created by excessive flare.

So I actually disagree with the notion effective speed is increased by flare effects. Perhaps the speed "point" is increased, but local contrast in the shadows is decreased. If speed is a means to an end (ie sufficient local contrast in the shadows), we've lost more than we've gained, and this is compounded by reducing exposure.
There's flare and there's excessive flare. All optical systems have flare. We just don't notice it unless it's excessive. Normal shooting conditions have normal flare and flare is part of normal film processing and part of film speed.

Fun fact about flare and shadow compression. Ever wonder why Tri-X professional, with it's long toe, is considered a "studio" film? There's less flare with interiors and the ability to control lighting. In theory, regular Tri-X shot in daylight would have similar tonal distribution in the toe as Tri-X Pro shot in the studio.