Aperture, Shutter, Depth of field

Aperture

http://www.mir.com.my/rb/photography/fototech/apershutter/aperture.htm
http://en.wikipedia.org/wiki/Aperture
http://en.wikipedia.org/wiki/Diaphragm_(optics)

Shutter
http://en.wikipedia.org/wiki/Shutter_(photography)

http://www.mir.com.my/rb/photography/fototech/apershutter/shutter.htm

Depth of field
http://en.wikipedia.org/wiki/Depth_of_field

http://www.ephotozine.com/article/depth-of-field-explained-4631

http://www.mir.com.my/rb/photography/fototech/htmls/depth.html