Nikon D5300 - Manual (Page 247)

227 Technical Notes
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Identifying CPU and Type G, E, and D Lenses
CPU lenses can be identified by the presence of CPU contacts, type G, E, and D lenses by a
letter on the lens barrel. Type G and E lenses are not equipped with a lens aperture ring.
CPU contacts Aperture ring
CPU lens Type G or E lens Type D lens
When using a CPU lens equipped with an aperture ring, lock the aperture ring at the
minimum aperture (highest f-number).
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Matrix Metering
For matrix metering, the camera uses a 2016-pixel RGB sensor to set exposure according to
tone distribution, color, composition, and, with type G, E, or D lenses, distance information
(3D color matrix metering II; with other CPU lenses, the camera uses color matrix metering
II; which does not include 3D distance information).