apodized phase contrast

A variation of phase contrast that features rings of neutral density film on either side of the phase film in the detection phase plate to help attenuate halo artifact.

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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.