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A4: af point illumination, A5: focus point wrap-around – Nikon D90 User Manual

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a4: AF Point Illumination

Choose whether the active focus point is highlighted in red in the viewfinder. This
option is available in all shooting modes.

a5: Focus Point Wrap-Around

Choose whether focus-point selection “wraps around” from one edge of the
viewfinder to another. This option is available in all shooting modes.

Option

Description

Auto

(default)

The selected focus point is automatically highlighted as needed to establish
contrast with the background.

On

The selected focus point is always highlighted, regardless of the brightness of the
background. Depending on the brightness of the background, the selected focus
point may be difficult to see.

Off

The selected focus point is not highlighted.

Option

Description

Wrap

Focus-point selection “wraps around” from top to
bottom, bottom to top, right to left, and left to right,
so that, for example, pressing

2 when a focus point at

the right edge of the viewfinder display is highlighted
(q) selects the corresponding focus point at the left
edge of the display (w).

No wrap

(default)

The focus-area display is bounded by the outermost focus points so that, for
example, pressing

2 when a focus point at the right edge of the display is selected

has no effect.