I haven't checked the actual web-site as I don't use Photoshop, but I love the effect and can see me using this myself. Where I pinned it from said "How to Create a "Double Exposure" in Photoshop — Daily Epiphanie"
Sony Alpha - Gear Guide to the Best Lens Mount Adapters for Sony E-mount cameras including Sony and NEX still and video cameras
How To Blur Backgrounds In Photoshop – Shallow Depth of Field Effect
In this video I’m going to show you how to create a blurry background in Photoshop (the shallow depth of field focus). We’re going to apply the blur by using the Lens Blur Filter which allows you to apply the narrow depth of field so that some objects in the image are in focus while others are blurred.