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Why do some objectives of 20X or higher have a spring-loaded or retractable front lens assembly?

April 26, 2017assembly Lens retractable spring-loaded

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Why do some objectives of 20X or higher have a spring-loaded or retractable front lens assembly?

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These objectives usually have a very short free working distance-which means the front of the objective can inadvertently crash into the cover glass or specimen. A spring-loaded front lens assembly will retract upon gentle contact with the specimen. Such an assembly will not, however, protect against rough and continuous contact.