Ommatidia of a Dragonfly (Pachydiplax longipennis)
This is a single, almost full-frame, photo of the last dragonfly I posted. The dragonfly was suprisingly easy to shoot, unlike most dragonflies, even though it did eventually fly away. I only took one photo at this magnification, and I nailed the focus (more or less). Taken with my usual 2x teleconverter and reversed 28mm prime lens. With the full bellows setup, I'm capable of almost twice this magnification. Maybe someday I will get a photo of a dragonfly eye at my maximum possible magnification.
Dragonfly eyes are pretty amazing, I read that there can be 30,000 ommatidia on just one eye.
For more info on compound eyes, take alook at the wikipedia page on ommatidia (which incudes a photo I took):