No filters. I think all the UW pix were taken with strobes and WB set to flash. As far as post-processing, usually nothing more than cropping and a bit of gamma. Most were just cropped. I had to simple WB correct a couple (I hate green sand). One or two needed sharpening. The barracuda and sand dollar are grayscaled. The photo of the nurse shark swimming away was the only one that needed PhotoShop, as it was pretty well underexposed. All the others were run thru IrfanView - a freeware viewer with basic correction features. The D300 saves images in NEF (RAW) and JPG at the same time. These all came from the basic JPG files. I wonder if it's time to leave RAW behind? The D300 produces some pretty dramatic colors. It has a vivid mode, but I leave it off; and still I have to reduce saturation occasionally to get a more believable result. I love this camera - a BIG improvement over the D70!
Mark