- 2x = ND.3 (exposure adjustment = 1 stop, reduces ISO 1/2)
- 4x = ND.6 (exposure adjustment = 2 stops, reduces ISO 1/4)
- 8x = ND.9 (exposure adjustment = 3 stops, reduces ISO 1/8)
- As one of the premier filter manufacturers, Hoya filters continue to made from quality glass assuring the photographer clear, sharp and accurate images
- Hoya filters consistently provide even color all the way through the filter; All surfaces are ground and polished to specific thickness and tolerances