The Heliopan 72mm #11 Yellow-Green Glass Filter for Black and White Film is ideal for scenes where it is important to differentiate the green tonal values in black and white photography.
That bowl of apples you want to shoot by window light with black and white film will take on more snap when you use a green filter. The contrast boost this filter offers will darken the red values of the apples while lightening the green table cloth they are resting on, as well as the green paint on the wall.
Why not make your camera gear complete by adding a complete set of standard black and white contrast filters - green, yellow, orange and red. Along with a polarizer, you'll be covered for anything that comes along.