The Marshall Electronics V-LH4 is a lens holder designed to allow a Marshall 4300 series glass lens or 4000, 4200 series plastic lens to attach to an OEM board camera. This lens holder is compatible with board cameras equipped with an OmniVision Technology 1/3" B/W 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.