ggibson
Well-known member
More experiments: the Hoya 25A filter cuts around 590nm. Results are completely red in-camera so it is harder to compose, focus, and meter. It's even easier to blow highlights, so underexposing is usually necessary. Most other colors are gone but with a custom WB and Foveon Classic Blue color, I found it possible to get blue skies back. Combining this with a CPL should result in dark blue skies.
Some redwoods by Graham Gibson, on Flickr
Some redwoods by Graham Gibson, on Flickr