This is one of over 4720 effects generated by Filter Forge, a Photoshop plugin that allows you to create your own filters.
To open this filter, you must have Filter Forge 2.0 or higher installed on your computer. If you don't have it installed yet, click here to download Filter Forge
This ultra usefull snippet makes variable blurs, meaning they can be mapped out with B/W maps. This is a very usefull tool because instead of settling for blending with blurs, you can actually map out the blur. Currently filterforge does not support this, and its grainyness is only to save CPU power. It can easily be enhanced in nodes.
blur variable mappable map maps blurs blurryness samples sampled perling focus lens grain grainy