EXCERPT page containing first few paragraphs. 2020-09-26 11:40:45
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Optical distortion should not be confused with the natural (and physically accurate) stretching which occurs with wide-angle lenses near the edges of the frame; this is perspective, not optical distortion.
The ZF 18/3.5 Distagon shows “wave” or “moustache” distortion. This is of less concern on “DX” cameras where the distortion is of the barrel type to the ~12mm frame edge, but on a full-frame camera (18mm frame edge), it’s an issue for architecture and other critical work.
Wave distortion is not unique to the 18/3.5 Distagon; it is relatively commonplace with wide angle designs. For example, the Leica 18mm f3.8 Super-Elmar-M ASPH shows similar distortion.
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