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Crops at 24mm — Upper Left Corner
Top left corner
Corner results are always suspect in the sense that field curvature can make any lens look bad. With real-world 3D shots, the field curvature can help or hinder. Yet sometimes the corners are just weak in general; it can be difficult to be sure without extensive field shooting, or good quality MTF charts to provide hints (not available in this case).
- At f/2.8, all the lenses except the 14-24 show a smeared look, the latter showing good detail.
- At f/4, all the lenses improve nicely, but remarkably, the 16-35 is nearly the match of the 14-24.
- At f/5.6, the 14-24 and 16-35 are performing well, with the 24-70 close behind, but the 17-35 showing some weakness at upper left. The 24/2 remains blurred.
- At f/8 the 16-35 and 17-35 show a bit better contrast than the 14-24 and 24-70. The 24/2 still lags.
- At f/11, all the lenses are producing similar results.
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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.
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- 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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