Nikonian72 wrote:
Reflections in spiders' eyes are of a wide, diffused, encompassing illumination source, such as a light tent.
Yes, I think so, most likely a light tent curved over the end of the lens with twin flash. A popular method with MP-E 65 / MT24EX shooters. You can see how he positions the tent at different angles to the spider in the various pictures and that he shoots some of the shots with the flash heads at different angles and at different output levels - A & B. I have seen similar results with my twin flash hard box.