Dioptric Adjustment; Holding The Camera - Canon EOS 350D Instruction Manual

Dioptric Adjustment

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.
If the camera's dioptric adjustment still cannot provide a sharp viewfinder
image, using Dioptric Adjustment Lens E (10 types, optional) is recommended.

Holding the Camera

To obtain sharp images, hold the camera still to minimize camera
shake.
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Firmly grasp the camera grip with your right hand, and press your
both elbows lightly against your body.
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Hold the lens bottom with your left hand.
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Press the camera against your face and look through the viewfinder.
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To maintain a stable stance, place one foot in front of the other
instead of lining up both feet.
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Turn the dioptric adjustment
knob.
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Horizontal shooting
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).
Vertical shooting