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Cabo:Wendy..
Do you use photoshop for sharpening? If so, a technique called "Lab Color Sharpening" may be what you want. You basically separate out the lightness channel from the color and just apply sharpening to that channel. In my opinion it works way better than normal unsharp mask and doesn't sharpen the color channels.
If you do use Photoshop, let me know and I can round up the specific steps for creating a macro/hotkey for this type of sharpening.
By the way...Nice pics. I'm just the opposite on vacation. I take all the shots so there's almost none of me, they're all of my wife, who doesn't dive, or fish.
lukeROB:Try Sharpening only the Luminosity channel - converting to Lab colour is acutally changing the image values and then changing them again to convert back. It is also easier then changing back and forth.
NetDoc:The Moon Jelly is way cool! So is the NC Beach scene and the Jax hrimp Boats. I liked the others too, but those were exceptional to me.