apodized dark low phase contrast objective (ADL)

An apodized phase contrast objective where phase objects appear dark against a light gray background.

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Apodized Phase Contrast

In apodized phase contrast microscopy, halo attenuation and an increase in specimen contrast can be obtained by the utilization of selective amplitude filters located adjacent to the phase film in the phase plates built into the objective at the rear focal plane. These amplitude filters consist of neutral density filter thin films applied to the phase plate surrounding the phase film as illustrated in the tutorial window.