Canon EOS 30D Instruction Manual

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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