Canon EOS 5D Mark III Instruction Manual page 362

Troubleshooting Guide
The maximum burst during continuous shooting is lower.
If you shoot something that has fine detail (such as a field of grass),
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the file size will be larger and the actual maximum burst may be lower
than the number mentioned on page 121.
ISO 100 cannot be set. ISO speed expansion cannot be selected.
If [z3: Highlight tone priority] is set to [Enable], the settable ISO
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speed range will be ISO 200-25600 (or up to 12800 for movie
shooting). Even if you expand the settable ISO speed range in [ISO
speed range], you cannot set expanded ISO speeds (L, H, H1, H2).
When [z3: Highlight tone priority] is set to [Disable], ISO 100/125/
160 can be set (p.146).
The Auto Lighting Optimizer cannot be set.
If [z3: Highlight tone priority] is set to [Enable], the Auto Lighting

Optimizer cannot be set. When [z3: Highlight tone priority] is set to
[Disable], then the Auto Lighting Optimizer can be set (p.146).
Even though I set a decreased exposure compensation, the
image comes out bright.
Set [z2: Auto Lighting Optimizer] to [Disable]. When [Standard/Low/

High] is set, even if you set a decreased exposure compensation or flash
exposure compensation, the image may come out bright (p.169).
The Live View image or movie shooting image is not
displayed during multiple-exposure shooting.
If [On:ContShtng] is set, Live View display, image review after image

capture, and image playback are not possible during shooting (p.177).
The multiple-exposure image is shot in 1 quality.
When the image-recording quality is set to 41 or 61, the

multiple-exposure image will be recorded in 1 quality (p.183).
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