Focal Press is a publisher of creative and applied media books and it is an imprint of Routledge/Taylor & Francis. The firm was founded in London in 1938...

The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power...

Oxford: Focal Press. ISBN 0-240-51574-9. OCLC 44267873. Ray, Sidney F. (2002). Applied Photographic Optics (3rd ed.). Oxford: Focal Press. ISBN 0-240-51540-4...

The CRC Press, LLC is an American publishing group that specializes in producing technical books. Many of their books relate to engineering, science and...

Producer's Business Handbook: The Roadmap for the Balanced Film Producer. Focal Press. pp. 218–. ISBN 9780240814636. Retrieved 29 April 2012. Doyle, Barbara...

dividing the system's focal length by the diameter of the entrance pupil ("clear aperture"). The f-number is also known as the focal ratio, f-ratio, or f-stop...

Biography of American Broadcasting. Focal Press. ISBN 978-0240812366. Retrieved May 7, 2017. "Sunday, May 2: 'Meet the Press' to broadcast in HD, debut a new...

In film and photography, a prime lens is a fixed focal length photographic lens (as opposed to a zoom lens), typically with a maximum aperture from f2...

Lenman, Oxford University Press 2005 "The Focal Encyclopedia of Photography", Richard Zakia, Leslie Stroebel, Focal Press 1993, ISBN 0-240-51417-3 Stroebel...

Focal-JMlab is a French company that has been designing and selling high fidelity audio systems since 1979. Based in Saint-Étienne, the company manufactures...