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Shifted Image Quality
In the samples below, the five lenses were tested with the camera fixed on the tripod; the only change was switching the lens. A variety of other subjects were photographed and checked for consistency with this example, which accurately reflects the performance to be expected from each model (with the caveat of sample variation).
On a full-frame camera (sensor/film of 36mm X 24mm), Nikon rates the 28mm PC-Nikkors for 11mm shift in the short direction and 8mm in the long direction. The PC-Nikkors clearly denote this on the lens itself with a white dot and scale as the lens is rotated. Schneider rates the PC Super Angulon for 11mm either horizontally or vertically and 9.5mm diagonally.
Those with full-frame cameras (such as the Canon EOS 1Ds Mark II) should be aware that optical performance will decrease significantly beyond the 2/3-frame (23.7 X 15.7mm) sensor area of the D2X. However, the full-frame-sensor cameras as of June 2005 do have larger pixels than the Nikon D2X, which demands less resolution from the lens; this factor mitigates the performance loss to a limited extent.
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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.
