The Marshall Electronics V-LH4-IR Miniature Lensholder with FIRC-650 Coated IR Filter is designed to allow a Marshall 4400 or 4300 series glass lens to attach to an OEM board camera. This lens holder is compatible with board cameras equipped with an OmniVision 1/3" color CMOS chip. The barrel thread size for this lens holder is designated as being M12 x 0.5, where M12 stands for the number of threads on the holder and 0.5 denotes the pitch between threads.