We are now imitating the dark image with blurred edges effect of the camera obscura in Photoshop.
Zoom effect in Photoshop
A zoom effect lends dynamics and highlights themes
Mock-up effect in Photoshop
A mock-up cityscape by playing with focus.
Selective blur in Photoshop
A zoom blur highlights the main theme.
Background blur II. in Photoshop
A mock-up looking effect with an imaginary tilt lens.
Background blur in Photoshop
Faking it: depth of focus