Lenses, prisms, mirrors and other optical elements, of any material, mounted, being parts of or fittings for instruments or apparatus, other than such elements of glass not optically worked
Filters, optical, being parts of or fittings for instruments, apparatus and appliances, framed or mounted
Lenses, prisms, mirrors and other optical elements, mounted, of any material, being parts of or fittings for instruments or apparatus (excl. objective lenses for cameras, projectors or photographic enlargers or reducers, such elements of glass not optically worked, and filters)