I suppose I post this because it was difficult...to accomplish. First, the 70~200f4 seems to be back focusing...a millimeter or so when used as a macro lens at it's maximum possibility. Still, I knew there was a picture here to be found...so I oiled up the sea shell, shot it a half dozen more time, backed off the focus in manual just a tad, and then in PS, used my gray point to make the whole thing blue. I like the orange red version also, as well as the black/blue one. Eventually I'll make tiny ones for comparison and post them as a comment.

LOL...I finished up this Challenge in a hurry...raised eyebrows