The Cokin Diffuser Light filter is exactly what it claims to be. It provides a minimum of diffusion and is most commonly used in portraiture, however, it can also be used in landscape photography.
This filter measures 130 X 170mm and only fits the Cokin X-PRO series holder.
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I'm not a big fan of diffusion effects in general, as it's usually overdone. However, there are occasions when I want to just take the edge off a lens' brutal sharpness, such as environmental portraiture, or with some landscapes where I need to blend hard lighting contrasts a bit, such as when shooting streams canopied with trees, with high-noon sunlight blasting through. This Cokin 820 Diffuser Light filter is one of the few offering a very subtle diffusion, rather than in-your-face, fuzz-ball diffusion effects that blot out too much detail. Unidentifiable (extremely diffused) subjects do not equate with dreamy, at least to me, but many would disagree, so experiment to find a degree of diffusion that pleases you, or, more importantly, your client!