EXCERPT page containing first few paragraphs. 2019-03-24 15:28:47
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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 22.214.171.1242. 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).
- In-depth lens evaluations covering behaviors not likely to be found anywhere else, based on real-world field shooting.
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- Aperture series from wide open through stopped down, showing the full range of lens performance and bokeh.
- Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.