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. Computar 1.8~3.6mm Auto Iris Lens (Video Drive) Varifocal lens (CS Mount) 1/3", 1.8~3.6mm, f1.6, auto iris (Video Type) TG2Z1816AFCS$168.00Specify camera brand and model: Computar 5~50mm Auto Iris Lens (Video Drive) Varifocal lens, (CS Mount) 1/3" 5~50mm f1.3, auto iris (Video type) TG10Z0513AFCS$159.00Specify camera brand and model: Packaged security camera systems | Security Cameras | Unitized Security Cameras | Board & Mini Security Cameras | Covert security cameras | Video transmission | Security Camera Lenses | Monitors | Time lapse recorders | Switchers Quads Multiplexers | Housings & mounts | Wireless video | Installation Necessities | Motion detectors | Power supplies | Cabinets & Racks | 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 | buyviconcctv.com www.securityideas.com is TM & © 1999-2008 Security Design Services Corp. All promotional art, characters, logos and other depictions are TM & © their respective owners. All Rights Reserved.