1/3" Varifocal Manual Iris Lenses Manual iris lenses are best used for indoor applications where the light conditions remain constant. 1/3" Varifocal Auto Iris Lenses (Direct Drive) Auto iris lenses are used primarily in outdoor applications or any location where the light conditions vary. Direct Drive auto iris is the most common type. All cameras we sell use direct drive (DC) lenses. 1/3" Varifocal Auto Iris Lenses (Video Drive) Auto iris lenses are used primarily in outdoor applications or any location where the light conditions vary. Video Drive auto iris lenses are specifically for cameras that require this type of lens. 1/2" Varifocal Lenses 1/2" Lenses can be used with 1/2" or 1/3" format cameras. Lens Selection Guide A guide to selecting the proper lens. Packaged security camera systems | Security Cameras | Unitized Security Cameras | Board & Mini Security Cameras | Covert security cameras | Video transmission | Security Camera Lenses | Monitors | Housings & mounts | Wireless video | Installation Necessities | Motion detectors | Power supplies | Power protection | Video Signal | Digital Video Recorders | Remote Video Systems | Video Over Network | Security Products Contact Our Sales Dept. Comments to: webmaster@securityideas.com Site design by Superior Media Security Design Services family of companies securityideasvar.com | cctvhardware.com | allkindscable.com | securityideas.com www.securityideas.com is TM & © 1999-2010 Security Design Services Corp. All promotional art, characters, logos and other depictions are TM & © their respective owners. All Rights Reserved.