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Thank you @fotostef! A small aperture is the #1 trick, those two sunbursts were both shot at f22. A wide angle lens also helps so the sun is a bit smaller in the frame. Lowering the "highlights" slider in Photoshop RAW or Lightroom helps define the star effect even a bit more. Hope that helps!

Thanks a lot!
I'll try this at first chance :)

Cool! Have fun and happy shooting!