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Both my 5d Mk3's are locking up intermittently. So far I've lost two wedding ceremonies from these cameras. I'm using genuine Sandisk extreme pro 32gb cards. I'm trying now to induce the problem at home to see if I can work out what is going on. So far it seems to me that the camera may be trying to write a file larger than fat32 will allow. Times the cameras have locked up have been around the moment the camera is about to split the file and start a new file to reach the 29 min mark. When the problem happens the footage starts to skip on the display for about 3 seconds then freezes. Only taking the battery out will unfreeze the camera. The footage of the previous 12 mins is lost completely. Does any one know of a forum dealing with this problem I can join? Canon really need to do something about this ASAP. The camera is useless for events until you can trust it will not loose your footage! Is anyone else experiencing these problems?

as a professional DP for about 17 years, i do understand and agree with you that the talent of a DP and the work arounds for the lower end consumer cameras really can make much more out of prosumer cameras such as a GH2 or 7D. I have shot many popular music videos and commercials mixing epics and alexas with 5Ds and no one can tell the difference in the footage, of course these are mostly on big productions with every thing lit very well. this brings me to say, environments not lit very well, or too dimly lit, or too brightly lit, all fall apart in quality on the prosumer cameras, especially the GH2 and the 7D. this is built on many many years of experience. not only have i seen this in comparison but i have first hand experience with when the GH2 was first hacked, i had a pl mount, put on the best lenses in the world, and man, in a nicely exposed environment i was shocked how sharp and clear it was. i decided to do a handheld scene with it that moved through different environments, some perfectly lit, but some, still at exposure, were more dramatically lit with more dark corners and shadows...to my surprise, and i was embarrassed, mainly because i sold production on this camera for b roll, that as soon as i entered any more dramatically lit environments the image completely fell apart, banding, grain, the works. i wound up doing the scene with the RED MX camera, epic wasnt out yet... needless to say i wound up selling the camera on ebay. this is not only what i found with this camera but its with all dslr or consumer products. i had an alexa, a 5dMK3 and a 7D on a job this year, and the alexa and 5D cut together beautifully, but the 7D's operator decided to get artsy and shoot from a less front lit area, needless to say, it had artifacts all over it...again this year with my 5DMK3, i have done about 12 jobs with it, 11 in hugely lit sets, green screen, etc, and the vfx and post companies were all extremely happy with the footage. one job however, well, it was a short film, the director wanted it darker and more dramatic then i had it lit, which looked beautiful in our monitor, so we made a few changes and basically just removed the fill, the monitor was still looking ok, but when we went back to the computer to look at the footage, it was grainy as hell, at 320 asa, all i did is put back in the fill light and the footage was grain free. my lesson is that when i am asked to shoot on a pro-sumer camera, i know the job is going to be a little tougher and you have to be a little more precise on every single shot, you cant just light the environment beautifully and go.

Apparently I've heard on another forum that this problem is related to using sandisk extreme 32gb 60Mb cards. I'm Using sandisk extreme pro 90Mbs. Has anyone else have problems with this combination?

I use the iPhone 4 as my personal camera. The Mark III is by default, my Mark II was stolen as was replace by the Mark III, I had no interest in getting the Mark III because of all the softness issues, I was even paying attention to cure for the softness.But I don't see it in my clips so I'm not going to worry about it. My two favorite lenses for the GH2 are the 12mm Olympus and 25mm Summicron. both are among the sharpest lenses I ever used. The 75mm Olympus is next......