Canon XSI Kit EOS DIGITAL REBEL XSi/EOS 450D Instruction Manual - Page 72
Changing the Depth of Field
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f: Changing the Depth of Field To obtain a blurry 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 1 Set the Mode Dial to . 2 Set the desired aperture. The higher the aperture, the sharper the picture will look with a wider depth of field. Turning the dial to the right will set a higher f-number, and turning it to the left will set a lower f-number. 3 Take the picture. Focus and press the shutter button completely. The picture will be taken with the selected aperture. About the Aperture Display The larger 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. 72