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Some objectives, 20x magnification or higher, have a spring-loaded or retractable front lens assembly. Why?

April 26, 2017assembly Lens magnification retractable spring-loaded

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Some objectives, 20x magnification or higher, have a spring-loaded or retractable front lens assembly. Why?

1 Answer

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Such objectives have a very short free working distance; hence the danger of inadvertently crashing the front of the objective into the cover glass or specimen. A spring-loaded front lens assembly allows this part to retract upon gentle pressure contact with a specimen. It will NOT protect against rough, continuous pressure contact.