Section 18 Optical, photographic, cinematographic, measuring, checking, precision, medical or surgical instruments and apparatus; clocks and watches; musical instruments; parts and accessories thereof 90 Optical, photographic, cinematographic, measuring, checking, precision, medical or surgical instruments and apparatus; parts and accessories thereof 90 02 Lenses, prisms, mirrors and other optical elements, mounted, nes Commodity Code Description 90 02 11 Objective lenses for cameras, projectors or photograhic enlargers or reducers 90 02 19 Other objective lenses 90 02 20 Filters 90 02 90 Other optical elements
