Canon EOS Rebel XT - Manual (Page 42)

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You can adjust the sharpness of the viewfinder image. 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
dpt to +1 dpt.
Turn the dioptric adjustment
knob.
¡ Turn the knob left or right until 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