Edmund Optics HP fixed focal length C-mount lenses are high performance, high quality machine vision lenses that are built with a rugged design to withstand harsh industrial environments. HP fixed focal lenses are available in 6 focal lengths. The 8mm, 12mm, 16mm, 25mm, and 35mm focal lengths lenses work with 1" and 1.1" sensors. The 50mm focal length lens works with 4/3" sensors. The locking focus and iris rings protect against unintended adjustments to ensure consistent results. The front filter thread makes it easy to use or change optical filters.