Here is a neat filter that lets you capture kaleidoscopic shots with your camera. The Freewell 95MM Kaleidoscope Filter is available in 77mm, 82mm and 95mm threaded versions. It works with 2.8/2/1.4 aperture. The below video shows what you can do with it:
More gadgets like this: here
Introducing PRISM Series by Freewell
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