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What do the letters PL or NH mean on a phase objective?

April 26, 2017letters mean NH Objective phase PL

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What do the letters PL or NH mean on a phase objective?

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The letters PL stand for positive low, a phase contrast in which the specimen appears darker than the background of the field of view. Less commonly used, the letter NH stand for negative high, a type of phase contrast in which the specimen appears lighter than the background.