■Lens filter■Adopts "super multi-coating" which has higher transmittance than conventional "multi-coating". Upgraded Color Temperature Conversion Filter Size: Φ2.2 x 0.3 inches (57 x 7 mm). Product Name: 55SW4 professional. Size: φ2.2 x 0.3 inches (57 x 7 mm). Weight: 0.6 oz. (16 g). Color Conversion (Warmer). Hue : Amber. Dekami Red Conversion Value: +4. Exposure multiples: 1.4x (+1/2 aperture).