Simulated Depth of Field
Go to the channels pallet and create a new channel. Click on the RGB eye. On the new ‘alpha’ chanel use the gradient tool set to default.
Click on the middle of the object you want in focus and drag up to the top of the object (not the screen).
Then change the ‘mode’ on the gradient tool to ’screen’. Click on the middle of the object you want in focus and drag down to the bottom of the object.
Go to the RGB chanel and select the object. Go back to the ‘alpha’ chanel and fill the selection with black. From the ‘Chanels’ pallet, go back to the ‘Layers’ pallet.
On the image layer, choose Filter > Blurr > Lens Blurr… On ‘Depth Map’ change ‘none’ to the ‘alpha’ chanel just created. Also for better quality click on the ‘More accurate’ radio button.