EXCERPT page containing first few paragraphs. 2024-04-18 19:56:46
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Examples: Corrected vs Uncorrected Lateral Chromatic Aberration
The Nikon 19mm f/4E ED PC-E has a huge image circle that covers an area that is actually larger than any medium format sensor, spanning at least 60mm (36mm + 12mm + 12mm = 60mm). That is a huge image circle!
In effect, the Nikon 19mm f/4E ED PC-E is a medium format rectilinear fisheye lens. To maintain high image quality is a challenge for an optical designer with a lens covering that large an area. While its control of lateral chromatic aberration (LACA) is outstanding, there nonetheless is some color fringing in the outer zones at full shift.
Mosaic crop
This crop is at full 12mm shift along the long edge, which is the worst case.
There is mild color fringing seen, most obvious on the white steps at center. This level of color fringing only a few years ago would have been considered very good on a regular (non shift) lens, but here that level of control is seen in an area far outside the normal 30mm frame. It is also hugely superior to the Nikon 24mm f/3.5 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.
Want a preview? Click on any page below to see an excerpt as well as extensive blog coverage, for example on Nikon or on Canon or on Pentax.
NIKON D810 + 19.0 mm f/4.0 @ 19mm
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