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What does the “R” after the 40x or 100x objective specifications mean?

April 26, 2017mean Objective r specifications

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What does the “R” after the 40x or 100x objective specifications mean?

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Both 40x and 100x objective housing are long and come very close to the slide surface when in focus. The tips of these objectives are “retractable” (R) to prevent slide or objective damage in case the objective contacts the slide: 40XR, 100XR.