'Mega' means one million, a megapixel means the number of one million pixels to form an image sensor.
The number of pixels is determined the picture quality on the image sensor. The number of pixels in conventional CCTV cameras are 300 ~ 400 thousands. The more number of pixel enables to express the better and detailed image. Megapixel lens is capable of providing the sharp result.
CS Mount
Focal Length Image Format Fixed Iris Manual Iris Aspherical IR lens
f=2.8mm 1/3"     SCVM028ASIR
f=2.8~8.2mm      SCVM2882DIR
f=4.0mm  1/2"   SCVHM04FASIR    
f=8.0mm      SCVHM08DIR
f=4.0~12.0mm     SCVHM4012MASIR  SCVHM4012ASIR
f=4.0~8.0mm     SCVHM408MASIR  SCVHM408ASIR