EXCERPT page containing first few paragraphs. 2022-08-18 15:53:15
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MTF (calculated*, not measured) is shown below at f/4 and f/8. Real lenses often fall short of calculated figures.
Performance is outstanding wide open at f/4, with no meaningful difference at f/8 other than a loss of overall contrast and micro contrast at f/8, the inevitable and unavoidable results of diffraction.
When f/5.6 is suitable (precise focus and adequate depth of field), it will thus be a superior choice versus f/8. That is, assuming focus shift is not involved, as it does not appear to be.
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