Schneider 72mm XL and filters

[Bob Salomon - HP Marketing]

It reduces the effect of the center filter.

[rdenney]

It reduces the effect of the center filter.

Thanks. Is that because it spaces it out farther from the lens?

Rick "appreciating the why" Denney

[Bob Salomon - HP Marketing]

Correct. And the lens must be stopped down at least two stops for a CF to have an effect on the fall off. Wide open or one stop down and a CF has no effect.