my dilated pupil
When I picked up my revised glasses (new lenses, same frames), the optometrist dilated my pupils with a pair of eyedrops (the first, an anesthetic, and the second, apparently a muscle relaxant) and had a look at my retinas, which are apparently some fine-looking retinas. My pupils stayed dilated for a few hours, so when I got home, I popped the extension tubes on the 50mm, showed Carin how to use them, and had her take a picture of my huge, dilated pupil.
It's properly white-balanced; I guess my eyes really are that greenish. (Or is there some kind of metamerism effect going on? I may have been under fluorescent light at the time.)
This image is also on the Wikimedia commons.