The Hoya 37mm REVO SMC Circular Polariser Filter allows you to significantly reduce reflections and glare from non-metallic surfaces. The REVO SMC polarising filter also enables colours to become more saturated and appear clearer with better contrast, this effect is often used by landscape photographers to increase the contrast and saturation in blue skies and white clouds. The REVO SMC Circular Polariser filter has been designed with a super-slim aluminium frame to reduce vignetting and is rotatable to allow full control over the desired effect. Hoya's SMC (Super Multi Coating) is applied to both front and rear glass surfaces to increase light transmission and prevent reflections. The coating is further protected with a clear water and stain resistant surface to allow easy care and handling of REVO filters in the field. The Hoya REVO SMC Circular Polarising filters are available in sizes from 37mm to 82mm diameter.