Originally posted by Dewman Thanks for the comments. As far as the "blue and black bee," I'm not sure but I suspect that what I'm seeing on MY monitor is not what you're seeing on YOURS. I DO notice a slight blue tinge on it's head, but.... other than that, I see no real blue. I might mention that this was one of my first attempts at using a reversing ring on a Pentax-M 50mm f:1.4 lens.
If he means the one on the yellow flower, then I can only see a hint of blue in the specular highlights. It can be lots of things, from aberrations to a reflection to resizing artifacts.
The bee's colors are fine, I've calibrated my monitor so I can say that with at least a modicum of confidence