makes sense to move it - thanks.
i came back to my post to clarify that i was referring to the one orange and one green streaks above the left duck's tail.
when i looked at it again, i realized it is not a "ghost in the machine" code, but a bug (dragonfly?) caught in the near field by my flash with a fresnel lens. anyone see another explanation?
snowbear: I do see what appears to be chromatic aberration in the left duck, too.
I sold my 1.4X teleconverter and now use a longer sigma zoom. i should go back to that pond and see if they are there, but may have to wait till spring to shoot and compare.