Polaroid White Balance Lens Cap For The Nikon D40, D40x, D50, D60, D70, D80, D90, D100, D200, D300, D3, D3S, D700, D3000, D5000, D3100, D3200, D3300, D7000, D5100, D4, D4s, D800, D800E, D600, D610, D7100, D5200, D5300 Digital SLR Cameras Which Have Any Of These (18-55mm, 55-200mm, 50mm, 40mm, 28mm) Nikon Lenses Helps Eliminate Undesirable Color Casts Provides Accurate White Balance Measurement Works with Any Digital Camera that has Manual White Balance Feature Just Slip It On, Or Use the Adapter Provided Compact, Stores Easily &lt;&gt; Threaded, Screw-on Design