Irix Edge 100mm Hard Gradual ND Square Filter

A hard graduated neutral density filter makes an abrupt transition from dark to clear, which is what a seascape or a flat desert horizon needs: the sky comes down several stops and the foreground is left untouched, with the change hidden on the horizon itself.

These are 100 x 150 mm rectangles for the Irix Edge IFH-100 and IFH-100-PRO holders, so the transition can be positioned by sliding the filter in the holder. Nano IR construction, multi-layer anti-reflective coatings and a double-sided NANO hydrophobic and oleophobic layer are standard; SR versions use toughened Super Resistant glass.