The OS200B is a classic, rail-based lens test bench with modern image analysis software. The bench is completely modular. Available options allow testing lenses with apertures up to 100 mm and focal lengths as short as 0.5 mm. Tests can be done at infinite or finite conjugates. Both positive and negative lenses, as well as afocal modules, can be tested. While the base model is manual, motorized stages are also available.