User Manual
NIKKOR Technology
Stepping motor
Operated with pulse electric power, this AF drive motor oers high response and
controllability for starting and stopping, and its simple mechanical structure allows for
supremely quiet operation – advantageous for video shooting and other times when
operational noise from the lens is a concern.
For the NIKKOR Z 50mm f/1.8 S, a new, powerful stepping motor that provides superb
driving power and quiet AF control is incorporated. With the higher driving power
through the strengthened rotational torque, even large-diameter lenses of a fast lens can
be easily controlled, resulting in high optical performance and high-resolution rendering.
Also, via the adoption of ball bearings for the shaft, smoother shaft rotation is achieved,
contributing to quiet and comfortable AF control. The high shock-resistant performance
of the motor further enhances reliability.
Rounded diaphragm
When shooting scenes that include point light sources such as street illuminations, blurry,
polygon-shaped spots are likely to appear in images. A rounded diaphragm was realized
by using specialized blades resulting in a beautiful, naturally round shape for out-of-
focus objects.
M/A (manual-priority auto) mode
Simply by rotating a focus ring, M/A mode allows you to switch from autofocus to
manual with virtually no time lag. This makes it possible to seamlessly switch to fine
manual focusing while looking through the viewfinder.
Internal Focusing
With this focusing method, all the lens elements are divided into front, middle and rear
groups, with only the middle group moving to focus. Variations in degree of aberration
caused by focusing are reduced. Also, lens-driving torque is light and weight balance
does not change during focusing. The focusing speed of AF lenses can be increased.
Multi-focusing system
Via the combination of multiple AF drive units providing driving power at high speed
and with high accuracy, the position of the focus groups is precisely controlled resulting
in superb imaging performance at all focus distances, as well as achieving extremely
accurate and high-speed AF control while strictly compensating aberrations. Even when
shooting subjects at the minimum focus distance that is likely to produce aberrations,
high-resolution images with minimized defects can be captured.
Mechanical technologies
NIKKOR Technology
Electromagnetic diaphragm mechanism
An electromagnetic diaphragm mechanism is incorporated inside the body of lenses and
controlled via electronic signals from the camera body. This permits incredibly accurate
aperture control even during high-speed continuous shooting.
Rear Focusing
With Nikon’s Rear Focusing (RF) system, all the lens elements are divided into specific
lens groups, with only the rear lens group moving for focusing. This makes autofocusing
operation smoother and faster.
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