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EXCERPT page containing first few paragraphs. 2019-05-22 12:58:36
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Sigma DP-1 Merrill

Autofocus Accuracy

The greatest impediment to a sharp image with any camera or lens is autofocus.

Many camera have trouble focusing on 3D subjects, and the Sigma DP1 Merrill is no exception. The use of manual focus is mandatory in some situations (zoom in)— this can be difficult in some lighting, one more reason an EVF would be helpful.

It would be possible and useful to have a focusing confirmation visual indicator when AF was achieved; then one could see what had been selected; perhaps the focused upon image area could briefly go brighter or some similar unambiguous effect (edge enhancement remains ambiguous on scenes like those here).

Examples

With commentary.

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Diglloyd Guide to Mirrorless offers comprehensive integrated coverage of most APS-C and full frame mirrorless cameras and lenses.

Special emphasis is placed on Sony full-frame, including Sony lenses and the high performance Zeiss Batis and Zeiss Loxia lenses plus Rokinon/Samyang and others. Fujifilm X, Olympus and Panasonic M4/3, Sigma dp Merrill and dp/sd Quattro are also covered in depth. Years in the making, it offers a wealth of material for choosing and using a mirrorless camera.

  • Make better images by learning how to get the best results right away. For example, the best way to set up your Sony camera.
  • Save money by choosing the right lens for your needs the first time, particularly with the numerous lenses available for Sony.
  • Make better images, a sort of “cheat sheet” saving yourself months or years of ad-hoc learning—best practices and how-to and processing parameters are discussed and shown.
  • Jaw-dropping image quality found nowhere else utilizing Retina-grade images up to full camera resolution, plus large crops.
  • 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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f/6.3 @ 1/20 sec; ISO 100
Sigma DP-1 Merrill

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