I had the opritunity to shoot a mixed martial art event and it was quite interesting, I took multiple lenses with me. I tried the Tamron 28-75 at 2.8 iso 1600, not so good. The lighting was horrible.
The Sig 70-200 2.8 didn't even make it out of the bag.
I also had my trusty pentax 50 1.4 (I ended up getting to shoot ring side so it was a little long.) I also had my favorite lense, pentax 31 1.8.
I was actually pretty pleased with the K10D at 1600, the only PP was done in lightroom 1.2.
WCFC MMA
Here are a few samples and a link to my flickr site if you want to see more.
CC always welcome.
Thanks for looking,
John