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And I thought you meant the shadow....

You'd be better off taking a picture of the lens unit from a higher angle or google search for an appropriate image. 

Not saying it can't be done in PS but doing so will make it look out of perspective, Even in you intend to superimpose just the lens, distorting the unit to match the perspective will make it look artificial, at worse, faked as compared to your sample. It's a rebuild of the unit and not just a simple cut and paste......

edit......   I saw TomMann's post just now..... and he's right,,,, it's not depth of field. But rather the Point of View of the lens shot.....