EXCERPT page containing first few paragraphs. 2017-12-16 14:38:33
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This dual aperture series at 14mm shows the severe loss of resolution that occurs due to the focus shift of the Nikon 14-24mm f/2.8G ED.
While the 14-24 is a very sharp lens wide open, its performance declines with stopping down, with an obvious loss of sharpness at f/4. And it never recovers the sharpness of f/2.8, even at f/9, due to its pronounced rearward focus shift. Shot with the Nikon D810, this behavior is even more damaging on a Nikon D850.
And yet with proper focusing technique, all that sharpness can be utilized. Accordingly, this page shows two series:
- One series focused once at f/2.8.
- A 2nd series focused at f/2.8 (same focus, no change as first series), but then refocused once more for f/4 and subsequent apertures.
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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 28 megapixels filling up to 5K display, 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.