The bird’s wing acts as a diffraction grating – a surface structure with a repeating pattern of ridges or slits. The structure causes the incoming light rays to spread out, bend and split into spectral colours, producing this shimmering rainbow effect, captured here by Victor.
Nikon D300s; Nikkor 80–400mm f4–5.6 lens at 400mm; 1/8000 sec at f11; ISO 200.
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