Canon EOS 5D - Manual (Page 44)

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By adjusting the diopter to suit your eyesight, you can see a sharp
viewfinder image even without eyeglasses. The camera’s adjustable
dioptric range is -3 to +1 dpt.
Turn the dioptric adjustment
knob.
Turn the knob left or right so that the
AF points in the viewfinder look sharp.
The illustration shows the knob at the
standard setting (-1 dpt).
Dioptric Adjustment
If the camera’s dioptric adjustment still cannot provide a sharp viewfinder
image, using Dioptric Adjustment Lens E (10 types, optional) is
recommended.
To obtain sharp images, hold the camera still to minimize camera shake.
Firmly grasp the camera grip with your right hand, and press your
both elbows lightly against your body.
Hold the lens bottom with your left hand.
Press the camera against your face and look through the viewfinder.
To maintain a stable stance, place one foot in front of the other
instead of lining up both feet.
Holding the Camera
Horizontal shooting Vertical shooting