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291Technical Notes
A 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).
A Matrix Metering
For matrix metering, the camera uses a 420-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).