Posted this on POTN also. Have you played around with 25A on your digital camera? I was testing for a stronger contrast in skyline so I slapped on a 25A - red filter on e-pm2. See these pictures. 1. 25A color picture 2. 25A converted to B&W 3. Orange Filter converted to B&W Is that what you'd expect? Does digital sensor not work with red 25A filter? Orange filter works well. 25A doesn't.