Cokin Diffusers have very little effect on the sharpness of the image. They merely diffuse 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. The 697 Diffuser Warm filter not only diffuses highlights but adds a slight warmth to the image.
This filter measures 85 x 85mm and fits the Cokin P series filter holder.