From Kolari Vision:
The Standard IR Filter (720nm) This is the tried and true classic infrared conversion. It allows for good color for false color, and good contrast for black and white. This is equivalent to the Hoya R72 and Wratten 89b.
When to get this infrared conversion: This IR conversion is good if you are interested in shooting some mild color and black and white. This filter produces the traditional dark blue skies and can also be processed for color.

Note: The exact size of this filter is 4×5,″ NOT the standard "4×5.65″ matte box size. However, it will fit perfectly fine into a "4×5.65″ matte box and should cover even the widest diameter lenses