Most Iray HDRI environment sets don't allow the depth of field use easily and DIRECTLY out of the box.

UltraHD IRAY HDRI With DOF - Meadows does!

You won't have to tweak anything; all the presets are there for you to just click and render.

What you'll get is 6 ULTRA HD (up to 16K) custom made environments, with or without Depth of Field presets. The theme of this set is "Meadows", a set of 6 outdoor scenes full of grass, trees, bushes, sea, quietness, and fresh wind. As usual, the sun is shining and the shadows are crisp!

Each environment is provided in 4 different resolutions, based on your needs and computer capabilities: 16000 x 8000, 8000 x 4000, 4000 x 2000, and 2000 x 1000. Each resolution is provided with or without Depth of field capability, which gives you a total of 48 different possibilities.

You can also use the DOF enabled environment and NOT activate the DOF of the camera for a 3rd and different effect, so the number of possibilities increases to 72 different possibilities.

Basically, based on your need, you click on the wanted resolution, you click on the wanted depth of field option, you click on the wanted Dome rotation preset, and you're good to render.

Take advantage of the HDR environment SPEED (versus full 3d environment which is way slower to render) with optimized Depth of field!