Just uploaded my images from Austin Comicon 2012. The Mrs and I like to go to cons, dress up - she's a big steampunker, and take pictures of various cosplayers.
Being a studio guy this can drive me a little nuts. You just don't have the kind of control over light at a con you do in the studio. Pair that with my hatred for on camera flash and you have a quandary. Austin was a prime example. There are a few places in the Austin convention center with beautiful light, but mostly that's not where the people are. Where the people are - the exhibit hall and conference rooms - you have halogen to florescent lighting. While it looks OK to the eye, turns out you don't have very much of it from your camera's POV.
I ended up cranking the ISO. While my D7000 does pretty well at high ISO, I was right on the edge of where you get a lot of noise. I push up to the limit and then deal with soft focus and movement blur.
The photos you see in my new Convention Folder are mostly from the cosplay competition. There were over 200 entrants. I sat on the aisle to get an unobstructed view, which should have been great. Until the host set up the "stop marks", where each contestant stopped on their parade and waited for the next mark to be clear. The problem was the host set one right next to my chair. Literally a foot and a half away from my seat.
That sounds like a good thing, but at that distance you can't see much of the cosplayer through the lens. They are too close. Which is why most the images I posted are head shots. That was the best I could do. Also when stopped and watching the next mark, the cosplayer was turned directly sideways to me. Some moved in my direction, but many just stood there focused forward the whole time.
Anyway, it was photographically challenging, but a great show. There were so many costumes and some great great ones I didn't get good images of.