The focal length of the lens is measured in mm and directly relates to the angle of view that will be achieved. Short focal lengths provide wide angles of view and long focal length become telephoto, with narrow angles of view. A 'normal' angle of view is similar to what we see with our own eye and has a relative focal length equal to the diagonal dimension of the pick up device.               Contact SALES Comments to WEBMASTER www.cctvhardware.com is TM & copyright 1999 - 2010 Security Design Services Corp. Security Design Services Corp. is an independent PelcoŽ dealer and is not affiliated with Pelco Corporation. All promotional art, characters, logos and other depictions are TM & copyright their respective owners. Pelco is a trademark of Pelco - Clovis, CA, and may be registered in certain jurisdictions. All Rights Reserved. Cameras | Video transmission | Lenses | Monitors | Time lapse recorders | Switchers | Quads | Multiplexers | Housings | Cabinets & Racks | Keyboards and Controls | Mounts | Scanners and Pan/Tilts | Camclosure | Spectra | Power Distribution | ImagePak | Domepak | Esprit | Receivers | Digital Recorders | Video over Network Security Design Services family of companies cctvhardware.com | allkindscable.com | securityideas.com Site design by Superior Media