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Some nosepieces have wider diameter openings into which the objectives are screwed. Why?

April 26, 2017diameter Openings screwed wider

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Some nosepieces have wider diameter openings into which the objectives are screwed. Why?

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In metallurgical microscopy, objectives are available for reflected light brightfield and/or darkfield observation. These objectives have a wide diameter barrel for use in darkfield reflected light; hence need for wider openings of the nosepiece. Such objectives may be labeled Neo or B/D or BF/DF.