Huge curvature of straight lines, provided by fisheye lenses, is the very effect many people buy such an instrument at all so it would be difficult to treat their high distortion level as a flaw; after all it is not corrected by definition, allowing to reach such an impressive field of view. Just to fulfill our chronicle duty we add here that our programs determined the value of this aberration as −18% on the APS-C and about −35% on full frame. Still applying such correction levels by the software didn’t straighten the distortion completely which means its real values are most likely higher.
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