The FB204 and FB205 stage focusing mounts are compatible with Prior's motorized stages for upright reflected microscopy. They are suitable for breadboard-mounted optical systems and customized microscopes. 

They incorporate the high-performance FB203 linear actuator for 38 mm Z-axis travel and have a high load capacity of 14 kg for use with heavy samples or large stages. 

FB204 is mounted in line with the axis of travel to provide a stable platform and maximize the height of the system. 

The base of FB205 is offset from the linear axis for integration with space-constrained customized optical systems.

Either the FB204 or FB205, when combined with a Prior stage and controller, provide an extremely reliable XYZ platform for both academic and industrial research into applications such as materials chemistry or semiconductor development. Its simple but high-performance design makes it easy to integrate with gantry based optics.