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By lens. for details, refer to, Af frame shape, etc. vary – Canon EOS-1D X Mark III DSLR Camera (Body Only) User Manual

Page 908

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Compatible Lenses and Autofocusing (Viewfinder
Shooting)

Group A

Group B

Group C

Group D

Group E

Group F

Group G

Group H

Group I

Group J

Group Classification of Lenses

Caution

Although the camera has 191 AF points,

lenses are classified into 10 groups (A–

J) which vary in the number of AF points available, AF point patterns, Area
AF frame shapes, and other details.
When lenses in groups F–J are used, fewer AF points are available.
See

Group Classification of Lenses

for lenses you will use.

Note

AF points in positions indicated by [

] blink when the <

> button is pressed

(while [

/

/

] points remain lit). For details on AF point blinking/illumination, see

Meaning of Lit or Blinking AF Points

.

For updates on “Group Classification of Lenses,” visit the Canon website or others.
Some lenses may not be available in certain countries or regions.

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