This is a 1/3 4mm MTV Infrared Sensor Lens with F1.2 aperture.
Posted by M*******s on 1st Jul 2011
Tested this lens with a Sony Effio DPS and Hitachi WDR in day and night.
Excellent in day light.
Can't see an improvend in darkness compared to the default 4mm lens delivered with the cameras.
Might be related to the fact that this cameras have the IR filter directly attached to the CCD.