Using Photoshop to locate camera settings

Projecting the image - Creating Pictures with Light

How to transform a room into a camera obscura

Aperture - experiments to gain an understanding of Depth of Field

Understanding the link between aperture and depth of field

Element 1 - Aperture and Depth of Field (DOF)

Aperture - An opening, in photography, the circular hole in the front of the camera lens which controls the amount of light allowed to pass on to the film from the lens. On all but very inexpensive cameras the size of the aperture is variable. The degree of variability is indicated by "i" numbers (f/stops). A great way to gain an understanding of apertures is to make and use a pinhole camera.

Quick Reference Guide - Manual Photography

INTRODUCTION TO PHOTOGRAPHY - CAMERA CRAFT