EXCERPT page containing first few paragraphs. 2023-03-25 03:47:51
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@15mm vs Nikon 14-24/2.8G Dual Focus: Pescadero Creek Downstream (Nikon D810)
This comparison was made with a 2nd brand-new sample of the Tamron SP 15-30mm f/2.8 Di VC USD, the first sample being optically skewed.
Prelude (key reading), focus shift and more
NOTE: focus shift can vary by focal length and focusing distance.
When comparing lenses, many factors come into play which can skew perceptions of the relative merits of each, depending on the scene and how the sharpest focus comes to bear: chosen point of focus but also focus shift and field curvature. It is also extremely difficult to match the zone of sharpest focus (try comparing a lens to itself!). Moreover, most all lenses have some variation in their optics which can degrade at least some portion of the frame (e.g., a corner or a weaker side).
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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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