Book Recommendation: Optics and Focus for Camera Assistants: Art, Science and Zen

Yes, this is the nerdiest book I've ever read. Whats nerdier is that I took notes on the whole thing.

I read this back in film school and it blew my focus skills wide open. I spent months thinking only in terms of depth of field. I cannot tell a lie, I'm a pretty amazing camera assistant and this book helped me get there.

This text is definitely more for filmmakers but a lot of the information is relevant to photographers. I don't know if the title "...& Zen" is a reference to the Robert Pirsig book Zen and the Art of Motorcycle Maintenance but Fritz Hershey seems to have a similar utilitarian perspective on his work.