Why shoot with a diffusion filter?

So if you happened to see below, one of the secrets to making video look like film is to shoot with a diffusion filter. Why, you may ask? Well there is a great posting addressing this issue at the DVcreators website, and it basically takes a better look at using Tiffen filters, which are known as some of the best in the market. There are also links to see and buy different filters. For example, by using one of the "Soft F/X 3" filters, when you zoom in on detail such as individual strands of hair, you see that the “video edge” is now smooth, but that the greater image is still sharp with crisp edges and still looks in focus. Click here to read the whole article