F: Changing The Depth Of Field - Canon EOS 650D Instruction Manual

f: Changing the Depth of Field

To blur the background or to make everything near and far look sharp,
set the Mode Dial to <f> (Aperture-priority AE) to adjust the depth of
field (range of acceptable focus).
* <f> stands for Aperture value, which is the size of the diaphragm hole inside the lens.
Blurred background
(With a low aperture f/number: f/5.6)
Aperture Display
The higher the f/number, the smaller the aperture opening will be. The
apertures displayed will differ depending on the lens. If no lens is attached to
the camera, "00" will be displayed for the aperture.
110
Sharp foreground and background Sharp foreground and background Sharp foreground and background
(With a high aperture f/number: f/32) (With a high aperture f/number: f/32) (With a high aperture f/number: f/32)
1
Set the Mode Dial to < Set the Mode Dial to < Set the Mode Dial to <f>.
2
Set the desired aperture. Set the desired aperture. Set the desired aperture.
  
The higher the f/number, the wider The higher the f/number, the wider The higher the f/number, the wider
the depth of field where sharper focus the depth of field where sharper focus the depth of field where sharper focus
is obtained in both the foreground
and background.

Turning the <6> dial to the right will
set a higher f/number (smaller
aperture opening), and turning it to
the left will set a lower f/number
(larger aperture opening).
3
Take the picture.

Focus and press the shutter button
completely. The picture will be taken
with the selected aperture.