We strongly suggest all of you a competitive lens with following character which is a outstanding data comparing with other suppliers.
Resolution: 8.0 Megapixel
Format : 2/3"
Aperture : F1.4 (Its true F1.4 big aperture, please see others are mostly F1.6, F2.5 or F2.8 which are too small iris and lower cost)
Focal length: 12mm
Distortion : -0.1% (Distortion is very very important for a machine vision lenss )
To definite a good or bad lenses by following info.
*** F1.4 is far better than F1.8 and F2.8
*** -0.1% is better than 1% or big number, which reflect a actual imaging
Please take care of above suggestions when choosing a lens, but not only depend on price