The Cokin Z-PRO 697 Diffuser Warm Resin Filter has 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 Z-PRO Series is recommended for focal lengths of 20mm onwards (in the 35mm format). This filter is made of CR39 Resin which is a reputable lightweight and shock-resistant optical material also used for ophthalmic glasses.
Can be used for general portraiture with the addition of added warmth - a benefit when shooting in open shade or cloudy days
Can bring skin tones back to a healthy appearance