Canon 3249B001 Instruction Manual page 20

Attaching and Detaching the Eye Cup
You can change the position of the eye cup for use with either the left or right eye. Detach the eye cup
and reattach it when changing the position of the eye cup for right or left eye use.
Attaching the Eye Cup
Align the hole for the dioptric adjustment lever with the lever, and pull the eye cup into
position.
Right eye use Left eye use
Detaching the Eye Cup
Detach the eye cup as shown in the
illustration.
20