EXCERPT page containing first few paragraphs. 2019-08-24 01:14:42
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This series at MOD (minimum object distance) assesses overall sharpness along with focus shift and secondary color aberrations.
Adobe Camera Raw 126.96.36.1992. View ACR settings.
Diffraction mitigating sharpening used for f/11.
Close range is a challenge for lenses, so MOD is the biggest challenge. Many vendors go to some effort to keep image quality high, including “floating” lens elements, and the use of optical “balancing” tricks to keep performance high. These tricks often come with liabilities, such as the one seen here: a very substantial focus shift, particularly in the center of the frame.
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These systems are hugely expensive, so make the right choice for your own needs (full frame vs medium format).
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