Spider, Speedlite, and Kenkos

I got an oppertunity to use the new speedlite I got for Christmas. Found a spider (in spite of close examining, I could not find a red hourglass on this one) in the bathroom. The EF 70-200L II IS focuses too far away by default, but with a little encouragement from a full stack of Kenko extension tubes, it brought the focus distance down to about 12" (and zoomed to 200mm). I put the speedlite on the ground angled up, and shot parallel to the floor. It took a few shots to dial in the correct amount of flash, it worked out to be around 1/16.