Cameras
Reviewing some of the basics of optical imaging systems
helps reveal some of the implicit assumptions often made in producing
images with computer graphics.
Ideal pinhole camera
![](img/idealpin.gif)
Real pinhole camera
![](img/realpin.gif)
Aperture with a lens system
![](img/lens.gif)
Why is depth-of-field limited?
![](img/dof.gif)
Camera Elements
![](img/cam_ele.gif)
The 'aperture' of a lens is the diameter of the lens opening
divided by the focal length of the lens. For a typical 50mm lens,
the aperture may range from f/2 (large aperture) to f/22 (small aperture).
The aperture will determine the depth of field of the resulting image.