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Sliding Focusing Mechanism

Mechanical method of changing the focus of an optical assembly, such as a laser beam expander or imaging lens, in which optical components are not rotated during translation, which minimizes beam wander and image runout. However, this requires more complex mechanics than rotating focusing mechanisms, which rotate the optical elements during translation, typically increasing the cost of sliding focusing mechanisms. Helicoid barrels are a common type of sliding focusing mechanism.

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