Canon EOS 6D Instruction Manual page 82

Cautions for <F> (Handheld Night Scene)
During Live View shooting, it may be difficult to focus dots of light such as
in a night scene. In such a case, you should set the AF method to [Quick
mode] and shoot. If it is still difficult to focus, set the lens' focus mode
switch to [MF] and focus manually.
When shooting flash photography, if the subject is too close to the
camera, the picture may come out extremely bright (overexposure).
If you use flash when shooting dimly lit night scenes, or human subjects
in situations where the subject and background are both near enough to
be illuminated by the flash, the shots may not align correctly. This can
result in a blurry photo.
Regarding flash coverage:
• When using a Speedlite with automatic flash coverage setting, the zoom
position will be fixed to the wide end, regardless of the lens' zoom position.
• When using a Speedlite with manual flash coverage switch, shoot with
the flash head retracted to the wide (normal) position.
Cautions for <G> (HDR Backlight Control)
Note that the image may not be rendered with a smooth gradation and
may look irregular or have significant noise.
HDR Backlight Control may not be effective for excessively backlit
scenes or extremely high-contrast scenes.
Cautions for both <F> (Handheld Night Scene) and <G> (HDR
Backlight Control)
Compared with other shooting modes, the shooting area will be smaller.
You cannot select RAW and RAW+JPEG. In other shooting modes, if
RAW is set, the image quality will be 73. Also, if RAW+JPEG is set, the
image will be recorded in the set JPEG quality.
If you shoot a moving subject, the subject's movement will leave
afterimages.
The image alignment may not function properly with repetitive patterns
(lattice, stripes, etc.), flat or single-tone images, or greatly misaligned
shots caused by camera shake.
Recording the image to the card will take longer than with normal
shooting. During the processing of the images, "buSY" will be displayed
in the viewfinder and on the LCD panel and you cannot take another
picture until the processing is completed.
If the shooting mode is set to <F> or <G>, direct printing is not
possible. Select another shooting mode and do direct printing.
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