Nikon 45mm-f-28D-ED-PC-E-Nikkor - Manual (Page 20)

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2. Major features
This is a retrofocus-type perspective control (PC) lens that lets you
emphasize or correct near and far perspective, or control depth of
field. It also lets you correct distortion caused by the camera angle.
Moreover, you can use the lens’ tilt and shift mechanism to achieve
focus of the entire subject plane when it is not parallel to the camera.
• This lens features automatic aperture control. When it is
mounted on a Nikon D3 or D300 camera, the user can use all
exposure modes to take images without operating the aperture
stop-down button.
• More accurate exposure control is possible when this is mounted
on a Nikon camera with 3D Color Matrix Metering capability,
because subject distance information is transferred from the lens
to the camera body (without tilting and/or shifting) (with
maximum aperture while mounted on cameras).
• The use of one ED (extra-low dispersion) lens element ensures
sharp pictures virtually free of color fringing. Also, by utilizing a
9-blade diaphragm that produces a nearly circular aperture, out-
of-focus images in front of or behind the subject are rendered as
pleasing blurs.
• The Nano Crystal Coat deposited on some of the lens elements
ensures that fine, clear images can be reproduced under various
shooting conditions, from the sunny outdoors to spotlighted
interior scenes.
• The closest focusing distance possible is 0.253 m (0.83ft).
• A total of two SB-R200 Wireless Remote Speedlights can be
attached to the front of the lens*.
* When attaching an SB-R200, tighten the shift lock release
knob. Failure to do so may cause the lens to shift down under
the weight of the SB-R200. Tilting and/or shifting the lens
while the SB-R200 is attached is not recommended.
The lens does not lock completely by turning the shift and tilt
lock-release knobs. This is not a malfunction. Turning the shift
and tilt lock-release knobs too tightly to lock the lens or forcibly
shifting/tilting the lens when it is locked can damage it.
Note on the shift and tilt lock-release knobs