I am a Pro MMMA (Mixed Martial Arts) fight photographer and Just used my new 5DMKIII to shoot a fight event. I was a bit worried that all would be perfect given the number of negative 5DMKIII posts here and on other boards and me mastering the new AF system - but then concluded that most negative forum posts were more attributed to user issues versus anything else.
MMA photography prohibits flash during fights, hence unlike the UFC with perfect lighting for PPV/TV coverage, local fight venues have a few rented light banks on a pole - so lighting is always a huge low light challenge requiring max ISO limits / fastest possible shutter speeds for action / and wide apertures that still protect enough DOF for 2 fighters.
My mistake - I left my 5DMKIII ISO selectable range set at 100-12,000 by accident from some earlier night tests. Fight night I rub my regular pre-fight tests and zero in at my desired settings (this night I choose to shoot TV as lighting is very uneven) - 320/4.0/3200 - and love the 5DMKIII's setting's lock switch. Start shooting and notice on my LDC that my images are looking brilliant, yet all other photogs are complaining that the low lighting is killing them - I just want to assume that the 5DMKIII is really performing well as I am now too busy to think of anything else - never noticing that my ISO was auto changing on each image shot. A couple of times I checked my INFO menu and always saw my locked down 3,200 setting. My only camera attention is on mastering the best settings for the AF as Canon did not provide a pre-set for MMA :-)
I get home and start to review my nights work and can not believe what I am seeing - my ISO settings are all over the board with a vast majority between 8,000 and 12,000
? I then realize that the metering system depending on my focal point was determining that more light was needed and the only variable available to the camera to adjust was ISO. I went ahead and just did my regular PP via LR4 set my noise reduction up a bit higher (40 ish) - and let everything run.
WOW! - I would have never had the nerve to test 12,000 ISO at a live pro sporting event - and the 5DMKIII delivered incredibly well - as this could have been a real nightmare situation with any other camera. I now plan on using this same auto ISO setting again and just tightening up the range a bit.
My photos are posted here - Please share your comments: http://www.tomhillphotos.com/5535402