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What has caused this please?

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Diffraction spikes from the blades as mentioned, stacking makes them worse. There are 2 per blade, 9 blades 18 spikes.

My first guess would be the aperture blades in the lens, too.  It's pretty much unavoidable because any "edge" in the lens system will cause diffraction, just like the spider vanes in a newt.  If you

It is the aperture blades, not the camera. I always use an aperture mask on my camera lens images and leave the aperture wide open to obviate this issue. Filter reducer adaptors make great aperture ma

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