Industrial Covert Unlimited is in its 20th year of operation. CU1.COM has been up since mid 1999. Great security & CCTV products and people who answer the phone!
Check this out!
Rainbow G50E 1" 50mm Fixed Focal Length DC Auto Iris CCTV Lens
Product Description

The Rainbow G50E is a 1 inch format cctv security camera lens with a video auto iris. This cctv lens utilizes a C mount system and has a fixed focal length of 50mm.
Furthermore the Rainbow G50E is compatible with 1", 2/3", 1/3", 1/2", and 1/4" format security cameras as well.