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Zeiss Otus 55mm f/1.4 APO-Distagon

Diffraction Flare with Stopping Down (Barn Interior)

With a well chosen scene and a world class lens (one not suffering from other contrast-robbing artifacts), an increasingly diffuse glow can be observed with stopping down—“diffraction flare”. No lens can avoid this effect no matter how well designed (though software processing can compensate to some extent).

Here, the bright cracks of light show the diffraction flare effect mildly as early as f/2.8. That flare broadens and brightens with stopping down due to diffraction; it affects all lenses but this is an excellent demonstration of its effects that are visible starting as early at f/2.8—possible because of the world class point spread function of the Zeiss Otus 55mm f/1.4 APO-Distagon.

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