The lenses of this group provide a fixed focal length and are mainly used in applications with a fixed working distance. Examples for these are e.g. industrial quality control, as well as taking images of documents. The lenses are available with different mounts. For the use with modern cameras lenses with CS-mount are available.

The other types are suitable for older cameras with C-mount. By using a 5mm adapter ring C-mount lenses can however also be used with CS-mount cameras. Suitable adapter rings are listed below in the section of accessories.