Canon EOS 70D Instruction Manual page 83

Cautions for <6> Night Portrait and <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, set the lens' focus mode switch to <MF>
and focus manually.
Cautions for <F> Handheld Night Scene and <G> HDR Backlight Control
Compared with other shooting modes, the shooting area will be smaller.
You cannot select RAW or RAW+JPEG. If RAW is set, the image will be
recorded in the 73 quality. 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 may leave
afterimages or the surrounding area of the subject may become dark.
The image alignment may not work properly with repetitive patterns
(lattice, stripes, etc.), flat or single-tone images, or images significantly
misaligned due to 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.
Cautions for <6> Night Portrait
During Live View shooting, it may be difficult to focus when the face of
the subject looks dark. In such a case, set the lens' focus mode switch to
<MF> and focus manually.
Cautions for <F> Handheld Night Scene
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 to shoot a night scene with few lights, the shots may not
align correctly. This can result in a blurry photo.
If you use flash and the human subject is close to the background that is
also illuminated by the flash, the shots may not align correctly. This can
result in a blurry photo. Unnatural shadows and unsuitable colors may
also appear.
External Speedlite 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 requiring manual flash coverage setting, set
the flash head to the wide (normal) position.
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