Spring Forest Orton, Great Falls National Park, Virginia.
Nikon D200, 70-210, Singh Ray Warm Polarizer, raw capture at ISO 100
Once I had processed my raw file and had my basic tone, contrast and saturation adjustments, I brought the image into Photoshop and created a duplicate layer. I then applied a Gaussian blur to that layer. The filter was set to 14.5 pixels in Gaussian blur. Then went back into the layer dialogue box and reduced the opacity of the duplicate layer to 45% thus creating the effect.
Please feel free to chime in and let me know what you think. All the best, Joe.