Arriving at a correct Exposure II

Aperture, in simplest of it's terms, is an opening. To take this simple meaning to its more correct form, we shall say that, aperture is an opening that lets the light in for exposing the film/sensor. Diving further, a simple thumb-rule is bigger the opening, more the light.

Arriving at a correct Exposure I

Assuming you are fairly abreast with basic thumb rules and fundamentals of still photography, let me proceed further to the basics of creating moving images with DSLRs. For correct exposure, DSLR Videography also has three parameters to play with, just like still photography. They namely are, Shutter Speed, Aperture & ISO.