Disclosed are high frequency-active blends comprising copolymers of ethylene and maleic anhydride or its functional equivalents and ethylene copolymers with polar comonomers such as ethylenevinyl acetate copolymers, ethylenealkylacrylate copolymers and ethyleneacrylatecarbon monoxide terpolymers; and films, powders, multilayer structures, and articles prepared therefrom. When such a separation is made, much longer intervals between replacement of the cleaning solution are possible while still obtaining satisfactory results. Each of the first lens group through the fourth lens group moves such that when zooming from a wide-angle end state to a telephoto end state, a distance between the first and the second lens groups increases, a distance between the second and the third lens groups decreases, and a distance between the third and the fourth lens group decreases.