Most of the arguments against fisheye lenses come from people shooting outdoors, where a bent horizon is an obvious mistake. Take one inside a domed church and the objection quietly disappears. There’s almost nothing in the room that’s supposed to be straight. This is the Rotunda of the Church of the Holy Sepulchre in Jerusalem, the circular space built over the Aedicule, the marble kiosk that stands at the centre of the frame.