Here's another shot I've been sitting on a while - a feeding Holcocephala fusca robber fly from last June. I don't remember exactly, but I believe this was a focus-stack of 3 images taken with the 50mm reversed on extension tubes.
It's easy to see why these little guys are one of my favorite Asilid species - those beautiful compound eyes are just spellbinding - I spent just about all last summer trying to get another "really" high-magnification portrait (more so than last summer) but had no luck in getting the shot(s) I wanted. I can't stress how many hours I've spent chasing these little flies around the woods of Oklahoma to no avail - these are some truly skittish animals.
They are quite a joy to watch though regardless of their difficulties as a photographic subject - I'll have to get some video of their hunting and mating behavior some day.