HMC X0 (Yellow/green) 77mmUsed primarily for black and white photography. XO is highly effective for outdoor portraits because red is rendered dark while green appears lighter.These filters. such as K2 (Yellow). G (Orange). 25A (Red). X0 (Yellow/green) and X1 (Green) are primarilly designed for use with Black & White film. However. they can be used with color film to produce special color effects.
