The cokin z pro 083830 diffuser 1 effect resin filter filters has very little effect on the sharpness of the image it merely diffuses highlights thus reducing contrast as such diffusers can be used to soften a landscape or soften skin texture in a portrait to hide minor flaws z pro filters are made of cr39 resin which is a reputable lightweight and unbreakable optical material also used for ophthalmic glasses the z pro series is recommended for focal lengths of 20mm onwards in the 35m