Online detecting is increasingly used in industrial process for the requirement of product quality improving. It is a trend
that the "machine detecting" with "machine version + computer intelligence" as new method replaces traditional manual
"eye observation". The essential of "machine detecting" is that image of object being collected with high resolution
video lens on sensor panel of photoelectric (CCD ,CMOS) and detecting result being automatically gained by computer
after the image saved and processed. "Machine detecting" is developing rapidly with the universal reception by
enterprises because of its fine accurateness, high efficiency and the real time. Video lens is one of the important
components of machine version system. Requirements of wide field and high resolution enlarged the complexity of
video lens design. In this paper a design case used in visible light with field diameter Φ32mm, β=-0.25× and NA'=0.15.
We give design parameters of the video lens which obtained with theoretically calculating and Oslo software
optimization: MTF>0.3 in full field and 215lp/mm, distortion <0.05%.This lens has an excellent optic performance to
match with 1.3 million pixels 1/2"CCD, and a high performance price ratio for being consist of only 7 single lens in the
way of 5 units.