Nikon Z 8 Reference Manual page 113

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Caution: Face/Eye-Detection AF
Subject detection may not perform as expected if:
the subject's face is too large or small relative to the frame,
the subject's face is too brightly or dimly lit,
the subject is wearing glasses or sunglasses,
the subject's face or eyes are obscured by hair or other objects, or
the subject moves excessively during shooting.
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Cautions: Animal-Detection AF
Subject detection may not perform as expected if:
- the subject's face is too large or small relative to the frame,
- the subject's face is too brightly or dimly lit,
- the subject's face or eyes are obscured by fur or the like,
- the subject's face and eyes are of similar colors, or
- the subject moves excessively during shooting.
The camera may display a border around subjects that are not dogs, cats, or birds but which
resemble these animals.
The light from the AF-assist illuminator may adversely affect the eyes of some animals; when using
animal-detection AF, select [OFF] for Custom Setting a12 [Built-in AF-assist illuminator].
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Cautions: Vehicle- and Airplane-Detection AF
Subject detection may not perform as expected with subjects that are:
- too large or small relative to the frame,
- too bright or too dark,
- partially hidden,
- similar in color to surrounding objects, or
- moving excessively.
The camera may fail to detect vehicles of some shapes and colors. Alternatively, it may display a
border around subjects that are not of the selected type.
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Subject Detection
The performance of subject-detection may drop:
during high-speed frame capture,
if [HLG] is selected for [Tone mode] in the photo shooting menu, or
if either [HLG] or [N-Log] is selected as the tone mode for [Video file type] > [ProRes 422 HQ
10-bit (MOV)] or [H.265 10-bit (MOV)] in the video recording menu.
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