This is the B+W Polariser Circular Filter XS-Pro Digital HTC Kasemann MRC Nano 49mm [BW1081470]For this high-end polarizing filter the foil pieces are selected individually for maximum colour neutrality. Following cementing between high-grade optical glass, additional grinding and polishing takes place. This guarantees outstanding sharpness even with very bright, apochromatic lenses. The latest cementing technique ensures lasting stability even in damp climates. The new generation of Käsemann High Transmission (HTC) polarizing filters is fitted whit a new polarizing foil which has higher translucency (transmission), yet still provides outstanding effectiveness. The filter extension factor is only 2 to 3, equivalent to approx. 1 to 1.5 f-stops. Available in the F-pro filter mount exclusively with MRC; in the XS-Pro mount exclusively whit MRC nano. Features: New generation of Käsemann Polarizers HTC = High Transmission Circular Higher light transmittance Filter factor 2 - 3, approx. 1 - 1,5 f-stops (standard polarizers: filter factor 4 - 8 = up to 3 f-stops) High polarizing effect Highest image quality by extra sanded and finely polished cover glasses Selected foil pieces for highest demands Premium Line XS-Pro Digital Professional Line F-Pro Both sides coated Durable because of newest laminate technology Premium Line XS-Pro available in Ø 30,5 - Ø 82mm Professional Line F-Pro available in Ø 37 - Ø 22mm Specification: ...Contact us if you need more help.