The extension tube has a very small depth of field, so I could only get part of the photo in focus. One of these days I'll try to get an eye with all three tubes, but it'll be difficult because I have to get in even closer (this shot is taken from less than 2" away.
In this photo: Bean Lens: Canon EF-S 18-55mm 1:3.5-5.6 II Attachment: Kenko DG Auto Extension Tube Set - 36mm