NIKON D800
Tamron SP AF 90mm f/2.8 [Di] Macro 1
ISO 100
F10.0 1/60 second
I got a tool for extracting broken bolts, but the bolt broke again, and the tool doesn't fit far enough down to take out the rest. So drilled it out the rest of the way and re-tapped the hole. It was a pain, but you can put a bolt in it again.