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It is very expensive to make irises with curved edges to minimise diffraction effects let alone with many blades. The Canon 50mm F1.8 has five blades giving ten diffraction spikes. You only get these many blades on the very expensive lenses. You could experiment by leaving the 50mm lens wide open and place a circular aperture in front of the lens. Even carefully cut black cardboard would do the job.
I personally think that diffraction artefacts have no place in real images if it can be avoided. If you like them that is fine.
Bert
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