David Elkins's The Camera Assistant's Manual, Fourth Edition is the best technical book around, and one of the best books on movies, period.
Dave manages to cover every aspect of an assistant's job, no matter how obscure or infrequently encountered. But the completeness is only one aspect which recommends it to any aspiring or working cinematographer.
Written in a clear, conversational manner, Dave manages to demystify both the jargon and the sometimes strange job of an assistant. His accounts of procedure for both first and second assistants clarify what we in the business call "industry standard": the accepted, professional way of conducting yourself and doing a job. Outside of a job on a
Hollywood set, it is nearly impossible to learn these classic, time-saving routines. And unless you've been a pro in the business, you're not going to know about such things as the relative merits of Magliner and Rubbermaid carts for hauling equipment.
The book covers the general characteristics of film, cameras, and lenses in such a way as to give a general technical education. Dave also gives a valuable overview of the camera department and its place in film production overall.
What many readers will find most useful are the sections on troubleshooting, the diagrams and threading patterns of every currently used camera, and the wealth of forms and lists to organize the on-set work.
I've tried to give a good idea of what the book covers, but it contains much, much more. I've been using The Camera Assistant's Manual since the first edition. This is the biggest and the best version. I only wish that, when I started as a camera assistant, I had had access to such a clear, helpful book.