....I've got one coming from B+H in transit at this moment. Have been using a polarizer...but then if the angle to the sun is not quite right in wide angles...sometimes the sky is inconsistent (but dramatic) I've used the red a few times with film (couldn't find it and too small a mm anyway)...but never with digital. I know...everybody says shoot in color and process in PShop and do that all the time...but sometimes it's fun to try and do it the old way. One of my cameras has a pretty good native B&W mode.... It's really fun to experiment...I tried looking it up on a google, and strange how little info there really was from people who've tried it...if my search terms were relevant. (thanks too Ralph) Just got it #25 red...Here's one of my first ones with it...In camera B&W jpg. Even though I set my contrast very low in camera to keep from blowing hights...it seems you've got to adjust the contrast in Photo Shop
alot to get anything.
I've been waiting to try it on a blue day with some puffy clouds....but it keeps raining...and the clouds keep rolling in. Edit: It seems the filter might be more useful on really bright sunny days...since it does take 2stops off. Also because of the way in which certain colors are restricted, it seems it throws the metering off a ways...although haven't used it enough to really determine how or working around that by compensating.