GSC HLS Consulting offers professional, quality assured assembling of lens and camera.
It is only about few adjustments: backfocus, aligning optical axis, autofocus set-up, automatic iris setting. But small errors will have massive impact on overall performance of your video surveillance system.
Improper backfocus would make your lens getting out of focus while zooming, autofocus may not perform as expected. Iris hunting will make your system hardly usable.
Last but not least, assembling lens and camera in a laminar flow cabinet / clean room will avoid dust particles on the camera chip and disturbing objects on your monitor.