Aperture explained in pictures. Shows how different aperture settings affect exposure.only one part of the exposure triangle.ISO and Shutter Speed are the other two.
Diffraction, Aperture, and Starburst Effects
Starburst effects can add an interesting element to a photograph. In a dark scene, it can add a dreamy, peaceful twinkle to the lights. In a daytime scene, a starburst sun can add drama and interest (Diy Photo Lighting)