Good job on the CA. Just a note - you go about it with a bit more nodes than you need. Using an HSV to just do color chip multiplication, and not to do actually anything with H, S or V, is a bit expensive.

Put R, G, and B in your color_math adders instead and get rid of the HSV.

Note also: If you had put the words "chromatic aberration" into Rendo search engine, with me as author, you'd find stuff.

http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2754029&page=3#message_3350582

Also discussed spherical aberration in that thread.

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