EXCERPT page containing first few paragraphs. 2020-12-05 17:08:14
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Data shown here for the Zeiss ZF.2/ZE 135mm f/2 APO-Sonnar. Behavior is identical for the Milvus 135mm f/2 (optical formula unchanged).
Zeiss and Leica consider 1-2% distortion as “nearly invisible”, with 0.5% definitely “invisible”. Yet on architecture, even 0.5% distortion can be plainly seen (straight lines give it away).
Pincushion distortion is easy to correct in various programs, but for most applications, the very low level of distortion makes it a non-issue.
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