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John Archibald Wheeler once summarised Einstein's theory of general relativity by saying "spacetime tells matter how to move; matter tells spacetime how to curve." It's one of the most exciting results in astrophysics, actually, that the fabric of spacetime itself isn't flat, but curved (in four dimensions)! Gravity can be visualised as the curvature of spacetime, distorting the very makeup of reality in proportion to an object's mass. For the physicist, it's a beautiful topology, but for a photographer, how is one supposed to capture these mind-bending, space-bending, even time-bending relativistic effects?
How should we capture the weird ways in which light is distorted for an observer moving close enough to light speed? Or how black holes and other massive objects can exhibit a phenomenon called "gravitational lensing", bending light around them to create duplicate images?
One solution is the fish eye lens. While fish eye lenses on special effects cameras are nothing new, Struman Optics has a fish eye lens that attaches to your smartphone with just a twist and a clip, thanks to the handy universal adapter. With the spherical effects of the fish eye lens, you can visualise the way in which everything causes tiny ripples and warps in spacetime, helping you give your photography an exciting edge and a different perspective on the nature of reality. Maybe use it to photography the night sky and think about how things look on the edge of a black hole, or imagine yourself travelling through a wormhole to a distant galaxy.