Canon EOS Rebel T4i Instruction Manual - Page 110

f: Changing the Depth of Field To blur the background or to make everything near and far look sharp, set the Mode Dial to (Aperture-priority AE) to adjust the depth of field (range of acceptable focus). * stands for Aperture value, which is the size of the diaphragm hole inside the lens. Blurred background Sharp foreground and background (With a low aperture f/number: f/5.6) (With a high aperture f/number: f/32) 1 Set the Mode Dial to . 2 Set the desired aperture. The higher the f/number, the wider the depth of field where sharper focus is obtained in both the foreground and background. Turning the 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. 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