I've read about the err80 problems which luckily I haven't encountered yet, maybe because I haven't used it with 85L.
0.5 sec exposure +/- 3 EV Bracketing (ISO 160 at F/13) causes the shutter to stay open and the camera displays err70 as you can see in the photo attached. This happens with or without a memory card installed.
This is happened on the last (In my case the longest exposure) It works fine if the base exposure I start with is at or faster than 0.5 seconds. The longest successful exposure I got with bracketing was 4.5 seconds.
I am using a 70-200 f/2.8 IS , it first happened with a 2x tc on. Same deal with a 135 f/2.
Interestingly enough, if I change to f/2.8, It works fine at the same shutter speed with braketing, :/
If anyone has any idea or can reproduce this error I would really appreciate any info. I will be contacting Canon tomorrow and see if they have any information.
Sometimes it doesn't display that error and just stays there as if it is shooting the photo but doesn't nothing for minutes straight at what point I restart the camera.
There is a firmware issue causing this. Something to do with the timer and long exposures. The next firmware update (no ETA) should fix it. No hardware needs to be touched to fix it. No need to send your camera in if you are seeing this particular issue