OS400B lens testing system

Wells Research and Development (WRD), a developer of innovative, modular instruments for optical testing, has released the OS400B, the newest version of the company's OpticStudio family of lens testing systems. The OS400B is a fully automatic, modular system capable of handling a wide variety of lens sizes, up to 100mm aperture. A computer is included, with PixelScope, the company's image analysis software.

The OS400B collects through-focus MTF (Modulation Transfer Function) data at multiple field points in just a few seconds. The system also plots field curvature, distortion, and chief ray angle, and is capable of measuring EFL and BFL (back focal length).

The base OS400B system includes a 600mm collimator with 80mm clear aperture, suitable for testing lenses with apertures up to 75mm. An optional 900mm collimator with 100mm clear aperture is available. On the low end, the system is capable of testing lenses with clear apertures as small as 150µm. The 1,280 x 960 pixel image analysis microscope has a numerical aperture of 0.4, making it suitable for lenses as fast as F1.25.

The system's rotation stage has greater than 180° travel, allowing testing of extremely wide angle lenses. The X and Z motorised stages each have travel of 40mm, and are precise, with sub-micron repeatability. The system includes version 5 of the company's PixelScope image analysis software. The system provides several reticles, including a USAF target and a narrow cross for MTF measurement. The system also includes a small form-factor computer and 19-inch monitor.

The standard OS400B includes a 1 metre optical rail (1.5, 2, and 3 metre lengths optional), 600mm collimator with 80mm clear aperture, four quick change LED light sources, and four quick change reticles. The motorised rotation stage is suitable for lenses weighing up to 10kg. The system includes a precision, 3-jaw, universal lens holder with Y axis adjustment capability. The image analysis microscope has an NA of 0.4, and utilises a high resolution 1,280 x 960 USB2 CCD camera. The CCD camera includes a close-up adapter which converts the 600mm collimator tube into a telecentric lens for measuring pupil size. The system includes a small form-factor computer and monitor.