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フィルムカメラ Nikon D850のPDF テクニカル・マニュアルをオンラインで閲覧またはダウンロードできます。Nikon D850 46 ページ。 Useful features
Nikon D850 にも：ユーザーマニュアル (10 ページ)

Auto AF Fine-Tuning

The D850 can fine-tune autofocus automatically. The re-

sults can be used with all lenses of the same type.

Use only as required. AF fine-tuning should be performed at

the focus distance at which the lens is normally used; fine-

tuning performed at short focus distances may be less effec-

tive with distant subjects and vice versa.

Ready the camera.

Mount the camera on a tripod and aim the camera at

a flat, high-contrast subject parallel to the camera fo-

cal plane. Note that auto AF fine-tuning works best

at maximum aperture and may not function in dark

surroundings.