"Master Shots" is a popular book series written by Blain Brown, a renowned cinematographer and filmmaker. The series provides an in-depth look at the art of cinematography, covering various aspects of camera work, lighting, and composition. The books are highly regarded in the film and photography industries for their detailed explanations, accompanied by numerous illustrations and photographs.
As for the PDF availability, I couldn't find any official sources that provide the "Master Shots" series in PDF format for free or for purchase. The books are widely available in print and e-book formats (e.g., Amazon, Barnes & Noble, Apple Books) but sharing or distributing PDFs of copyrighted materials may not be permissible.