This interactive web page explaining all of the aspects of cameras and lenses is really one of the most informative resources that I have found about the subject. Especially, the interactive sections that allow the reader to experiment with the various parameters of lenses and light make the entire understanding so much more complete. This page is an amazing resource for photographers and videographers.
"Pictures have always been a meaningful part of the human experience. From the first cave drawings, to sketches and paintings, to modern photography, we’ve mastered the art of recording what we see.
Cameras and the lenses inside them may seem a little mystifying. In this blog post I’d like to explain not only how they work, but also how adjusting a few tunable parameters can produce fairly different results."