Welcome to my blog, I'm Charles Johnson - a scientist and an amateur photographer. This site is devoted to all aspects of science related to photography. For more information read my About page.

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Charles S. Johnson, Jr.
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Comments[0] 06:41PM May 07, 2007 by Charles in Lenses
I am now posting Chapter 9:
Coming to terms with real (compound) camera lenses (pdf, 230 kb)
This chapter contains math, but I think the basic ideas can be appreciated without working through the derivations. Of course, some of us love math, and that is why it is here. An equation is certainly worth a thousand words! As always, comments will be appreciated. Also, please continue to report suspected errors via comments or in email. Thanks.