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Wells Research and Development has announced the OS400B, the newest version of the company’s Opticstudio range of lens-testing systems, at Photonics West.

The OS400B is a fully automatic, modular system capable of handling a 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 150um.

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.

MTF up to 1,000 lines/mm can be measured.

The OS400B’s rotation stage has greater than 180deg travel, allowing testing of wide-angle lenses.

The X and Z motorised stages each have travel of 40mm and are precise, with sub-micron repeatability.

The OS400B 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 19in monitor.

The OS400B is modular and can be operated in two modes.

In the first configuration, the image-analysis microscope pivots with the lens under test.

This configuration is more suitable for small lenses with a low chief ray angle and EFL up to 200mm.

Most lenses designed for use with CCD or CMOS detectors fall into this category.

The other configuration is a conventional nodal slide, in which the lens-under-test pivots around a vertical axis while the collimator and image-analysis microscope remain in relatively fixed positions.

In this configuration, lenses with EFL up to 1.5m can be accommodated with the optional 2m optical rail.

The backlight for the reticle uses a small-diameter integrating sphere to give uniform lighting.

The system includes four quick-change LED sources (R,G,B,W) with other wavelengths available.

The backlight can also be used with an optional halogen source, allowing operation out to 1um wavelength.

An optional bracket allows the reticle section to be removed and used for testing at finite conjugates.

The CCD camera can be moved from the microscope to the rear of the collimator.

A close-up lens turns the collimator into a telecentric camera.

This permits precise measurement of pupil size, as well as plotting pupil shape and location change versus field angle.

The standard OS400B includes a 1m optical rail (1.5, 2 and 3m 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 three-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 closeup 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.

Wells Research and Development

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