The cokin z pro series z006 yellowgreen filter is perfect for differentiating between green tonal values in black and white photography this filter enhances the light green colour of the leaves making it ideal for landscape photography it is also suitable for portraits as a result of its favourable effect on red tones the z pro series is recommended for focal lengths of 20mm onwards in the 35mm format the material used to make this filter is known to be used for ophthalmi