The OSH 20 is the standard optic for the low power laser systems. It offers great beam characteristics, such as an adjustable scanned beam-width of up to 2 in. in combination with a very small beam diameter.
The OSA 70 optic was designed for robotic applications. The optic is water cooled and can easily be attached to all common robotic systems. All internal components of the optic are accessible from the outside for fast maintenance times.