Light Stalking. Flash applets on some technical aspects of photography. Thin Lens Uses Gauss's ray tracing construction to show how thin lenses perform a 3D perspective transformation of object space into image space.
Depth of Field How do focal length, subject distance, F-number, and size of the circle of confusion affect depth of field? Digital Photography Tips: Digital Photography School. Cambridge in Colour - Photography Tutorials & Learning Community. Browsing Photography on deviantART. Digital Photography Review: Galleries.