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Aperture Series at 12mm Shift, Long Axis: Focus Placement is Critical (Mosaic, Nikon D810)
The Nikon 19mm f/4E ED PC-E is in effect a medium format lens projecting a huge image circle. To maintain high image quality over a 35mm frame at 19mm is a challenge, but to do it over an area 4X or so larger is a major challenge indeed.
Accordingly, something has to give, and it seems that the “give” is in allowing a significant amount of field curvature, such that that the placement of focus becomes a key determinant for image quality when fully shifted, particularly when shifted the full 12mm along the long axis of the frame.. Accordingly, this evaluation presents two aperture series from f/4 through f/11, each with its own focus.
The results are shockingly interesting, and are thus essential reading for anyone using the Nikon 19mm f/4 PC-E.
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Diglloyd DAP is DSLR-oriented, but also contains workflow and other topics. Much of the focus is on Canon and Nikon but also Pentax and Pentax medium format.
Special emphasis is placed on lens evaluation, focusing on Canon and Nikon and Sigma lenses, but with a few others like Rokinon/Samyang.
- Make better images by learning how to get the best results right away.
- Save money by choosing the right lens for your needs the first time, particularly some of the new Sigma Art lenses vs Nikon and Canon.
- Workflow discusses image organization, raw conversion and post processing. Many examples show processing parameters for direct insight into how the image was converted.
- Jaw-dropping image quality found nowhere else utilizing Retina-grade images up to full camera resolution, plus large crops [past 2 years or so].
- Real world examples with insights found nowhere else. Make sharper images just by understanding lens behavior you won’t read about elsewhere.
- 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.
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