This is an amazing diagram that can let everybody instantly understand the photographing effect of the various F-number (aperture ratio), Shutter Speed and ISO settings.
These 3 settings are the basic of photography. With this Cheatcard and some practices with the camera, new learners can soon master the trick of using their DSLR.
This Foto-Cheatcard is from a German photography blog called Hamburger Fotospots. You can click here to download its latest version in both PDF and JPG format.