Page 40 - D850_broschuere

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Fast, accurate focusing — Dedicated AF engine Simplified adjustment for more accurate focus — Auto AF fine-tune for viewfinder shooting

Like the D5, the D850 employs a dedicated AF engine. Working Accurate AF is crucial to take full advantage of the D850’s high pixel count. To ensure focusing accuracy, the D850’s auto AF fine-tune
in parallel with the sequence control microcomputer, it achieves makes subtle adjustments for each type of lens you use. The simplified process involves achieving focus in live view and letting the camera
simultaneous rangefinding at all 153 focus points, which contributes automatically acquire, then store, the AF tuning value.
to fast, accurate focusing. As a result, when shooting an athlete
portrait in auto-area AF, for example, it eliminates the need to select
focus points each time you change your composition, contributing Auto AF fine-tune steps
to a more efficient workflow.

Achieve focus at a focus distance you use Select “Yes” to save the tuning value. The camera automatically stores the result to
frequently in live view. Press and hold the AF-mode “Saved value” list.
and movie-record buttons simultaneously until the
next dialogue appears. Note: AF fine-tune must be turned on in the setup menu to enable the tuning value to be used for shooting.

Auto AF fine-tune system

1: Focus achieved in live view. Pentaprism
Mirror

Simultaneous rangefinding at all 153 focus points is achieved. Live view CMOS sensor
AF sensor
Precise focus on distant subjects with teleconverters — Powerful AF compatible with
an effective aperture of f/8
2: Difference of defocus amount (A) between contrast-detect AF (live view) Pentaprism
The D850 demonstrates powerful AF performance even when using a teleconverter. All 153 points are compatible with effective apertures of f/5.6 and phase-detection AF (viewfinder photography) is calculated.
or faster*. And fifteen focus points, including nine selectable points, are compatible with an effective aperture of f/8. Mirror
* Number of effective cross sensors varies with certain lens combinations. Viewfinder photography CMOS sensor

AF sensor
Focus points capable of AF and electronic rangefinding when using
AF-S/AF-I teleconverters 3: (A) is recorded as the AF tuning value and applied to viewfinder photography. A

For effective apertures slower than f/5.6 and faster than f/8 For effective aperture of f/8

Focus points (37): / / / Focus points (15): / / / /
Selectable points (17): / Selectable points (9): / /
Cross sensors (25): / Cross sensors (5): /
Note: Focus points other than cross sensors are line sensors detecting horizontal lines ( indicates sensors that detect vertical lines).

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