EXCERPT page containing first few paragraphs. 2019-09-21 00:54:59
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MTF is shown below at f/3.5 and f/8 for both infinity focus and at 0.2X = 1:5 (focus at 0.8 meters from imageplane).
Wide open at f/3.5, central sharpness is outstanding—razor sharp though not as bitingly sharp as can be achieved by the Zeiss Otus 85/1.4 APO Planar at f/2.8. Peak performance likely improves somewhat at f/4 and f/5.6. Still, this kind of performance for a macro lens at infinity makes the 120/3.5 extremely useful as an all-arounder in the field—not just a macro lens.
At f/8, diffraction effects are cutting contrast of coarse, medium and fine structures. Aside from the extreme corners (and limits on depth of field), f/3.5 is superior to f/8. That’s what one hopes for in a high-grade lens—outstanding wide-open performance that f/8 cannot meaningfully improve upon.
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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.
- How to configure menus and buttons and best operating practices, gotchas and how-to.
- Real world examples with insights found nowhere else. Make sharper images just by understanding lens and camera behaviors.
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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.