Increase your focus control using the latest greatest version of Photoshop
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Start by duplicating your background layer; it’s always a good idea to keep an untouched version of your original file on its own layer. Then go to Filter > Blur and choose Iris Blur from the menu. There’s no Blur Gallery menu item per se, but choosing Field, Iris, or Tilt-shift opens the gallery and gives you access to all three methods.