Photophys.com: The Science of Photography

I appreciate the feedback I have been getting primarily by email and posts on other forums.  Any kind of comment can help.  I, of course, need to fix typos, misspelled words, etc.  But I especially need comments about substance.  Is an essay trivial, or non-understandable, or boring?  And, what can be done to correct or to improve the chapters?  Are additional photographs or diagrams needed to illustrate points, and what other topics should be addressed?

I have decided to post the chapters as pdf files because most people are equipped to read pdf.  The originals are Word files; and the equations, Greek letters, and special symbols are provided by MathType.  Unfortunately, most photographers do not have MathType on their computers and cannot display the special fonts.

I am now posting drafts of Chapters 4, 5, and 6.  These are essentially essays of different sizes and difficulties.  The chapters may need to be combined or rearranged.

This set of chapters, especially Chapter 6, reveals more about the slant of the book.

4.  Images: What is Perspective?

5.  Why does a camera need a lens?

6.  Elementary Optics: How do lenses work?

I hope you enjoy them.