EXCERPT page containing first few paragraphs. 2019-03-24 21:43:04
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MTF is shown below at f/3.5 and f/8 for both infinity focus and at 1:5 (0.8 meters).
Sagittal slit orientation drawn with continuous line and tangential with dashed. White light. Spatial frequencies 10, 20 and 40 lp/mm.
Wide open at f/3.2, sharpness is outstanding is at very high levels across the field. Performance might bump up at f/4 and f/5.6, but Hasselblad does not provide those apertures. While outstandingly consistent across the field, peak MTF values fall well short of the Zeiss Otus 85mm f/1.4 APO-Planar.
At f/8, diffraction effects are reducing contrast of coarse, medium and fine structures. Aperture f/3.2 is thus superior to f/8 when one ignores its razor-thin depth of field. 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.
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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.