Did you have this problem before the electrical system got fried? I only ask because gremlins seem to always appear after a catastrophic event like that which no one can ever diagnose completely it seems. Continual repairs for unrelated problems would have scared me off that camera as probably a lemon. Maybe you can talk Canon services into giving you an exchange or deep discount on a refurbished one from their store, given the history of that camera. I would never tell them I was using anything but Canon lenses on the body, regardless my gear status. This gives them an out and excuse to not delve deeper for an answer to the problem.

I shoot before pics of client homes for reference and comparison to finished interior design shots I produce for designers and contractors. The before shots are sometimes shot using 3 brackets, sometimes 5 with a 5D MKIII. I usually use a 16-35mm LII for the before shots and mostly in the 20-24mm range. I would be interested in seeing what your final photos look like using 11-24mm at 7 brackets if you are so inclined to post a couple. I understand the real estate shoot and interior architecture shoot are 2 different animals, but rooms are rooms. Have you ever shot at 3 or 5 brackets and, if so, do you see the difference from 7 bracketed files?

I also have the 5DIII and have never had an issue using either of 2 Canon lenses or Tamron 28-300 lens. When I have any issue with this or my Panasonic camera, I take it to my local store and they are great about letting me try another lens, or whatever I need to do. If I don't understand something they are very patient and explain it in plain english, even though I didn't buy either of the cameras or lenses there. If something needs to be sent off for repairs they will tell me and explain what it will cost. If it's out of warranty they can fix it there. I do hope you get this ironed out, as it's a wonderful camera.

Hi Todd,
I shoot in Manual all the time and set the aperture anywhere from f-8 to f-13 for interiors and hold the ISO at 100 to keep noise at a minimum. The shutter speed becomes the variable for bracketing. For exterior photos, I set the aperture at f-13, but may bump that to f-18 if the sun is peeking over a rooftop so I can get a "star" affect.
I don't think technique is the issue here. I have been using this same technique for years.
Again, sometimes the 5DIII will bracket 7 and sometimes it won't. Two days ago, it worked flawlessly. Yesterday, it would not bracket at all. I have done a complete camera electrical reset and it did not correct the problem.

Todd, I am using 1 1/3 stops for a total of 4 over and 4 under. Not sure why this camera will bracket and sometimes it won't.
When I first started using the Tamron 15-30mm, it worked perfectly each time, except for my own user error. I had to learn to turn off the VC because it was sitting on a tripod. It took a few "ghosty" images until I realized my error, but then it was fine for a couple of months. I had a shoot 2 1/2 hours away and the agent was willing to do the driving. My first set up was from the street, looking through two stone gates. I bracketed for 7 shots and hit the shutter button on 2 second delay. The camera clicked off 7 times to the amazement of my agent client who has never seen such a thing. I proceeded down the driveway closer to the house and took 5 more views. When I got home, the first shot through the stone gates did not exist. The rest were fine. That's when I knew the camera had a problem. The next shoot, sometimes it would fire 7 times, sometimes it choked after 4 or 5, not recording any of the series.

I have a Canon 5DIII that I bought about 1 1/2 years ago. In the first year, I had to send it back to Canon for repair 3 or 4 times with completely different issues each time.
Of course, it is now out of warranty.
The newest problem is that it won't shoot a run of 7 bracketed photos, and chokes after 4 or 5. No images are saved to the memory card.
I wanted to include this camera body in my real estate photography work, but need a wide angle lens. The Canon wide angle for this work costs $3,000, so I looked for a less costly lens solution. I purchased a new Tamron SP 15-30mm f-2.8 lens. Great lens, although a bit heavy.
The first few times I used this lens, the 5DIII did a great job bracketing 7 shots, and I was pretty happy with the images.
Then, it stopped completing all 7 brackets.
I called Canon support. They argued that it was due to using a third party lens and I should talk to Tamron. I argued that I put this lens on my 7DII and it bracketed 7 shots perfectly.
Canon said that didn't matter and it was due to using the third party lens.
I did call Tamron and they suggested I try a different memory card. I did and it made no difference.
Has anyone else had an issue with shooting brackets with a 5DIII?