Nikon D780 - Non-CPU Lens Data

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Menu Guide >
B
The Setup Menu
Record data for non-CPU lenses. Recording the focal length and
maximum aperture of non-CPU lenses allows them to be used
with some functions normally reserved for CPU lenses.
Non-CPU Lens Data
G
button
U B
setup menu
Option Description
[Lens number] Choose a number to identify the lens.
[Focal length
(mm)]
Enter the focal length.
[Maximum
aperture]
Enter the maximum aperture.