We make the pinhole lenses CS mount varifocal 2.0 megapixel 4-20mm into mass production, which are used for steel company and high temperature furnace etc.
Most of high temperature furnace using fixed pinhole lenses 4mm, 6mm etc. in the past years,and some of lenses are not easy to find in the market. The 4-20mm varifocal CS pinhole lenses will make the steel company high temperature furnace surceillance be much more easy works.
Welcome your inquiry.