defocus

(dē-fōˈkəs)

transitive verb de·fo·cused or de·fo·cussed, de·fo·cus·ing or de·fo·cus·sing, de·fo·cus·es or de·fo·cus·ses

To cause (a beam or a lens) to deviate from accurate focus.

noun

The act or result of causing a lens to deviate from accurate focus.

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