The Irix Edge Reverse Filter is the best choice for sunsets and sunrise photography which can be difficult to shoot due to high contrast at the scene. To receive the best quality images, the reverse filter combines the features of both hard and soft filters. It is half transparent, turning to full denisty (hard gradual) and then dradually reducing the denisty (soft gradual).
Irix Edge Reverse Neutral Density filter do not affect the colouration of the image and the 0.9 density provides a 3 stop reduction in light from entering the lens in the central part of an image. All of the Irix Edge filters are characterized by the highest precision and optical quality to be able to meet the image quality generated by Irix lenses. Both surfaces of the glass filter are covered by the multilayer anti-reflex and water/oil-proof coating providing high light transmission and natural colours in any weather conditions.
Irix IFH-100 and other 100mm systems.