The FB206 stage focusing mount is designed for upright transmitted light microscopy and features a wide aperture to allow the development of customized diascopic optical systems on a breadboard. 

The mounting plate fits Prior's upright life science stages, such as the ES111, H101A, and H101N2F. Other customized mounts are available for Prior's inverted stages. 

The FB206 incorporates the high-performance FB203 linear actuator for 38 mm Z-axis travel and has a high load capacity of 14 kg for use with heavy samples or large stages.