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Olympus OM-D E-M5 Mark II
Panasonic/Leica 15/1.7 DG Summilux

Hi-Res Sensor Shift Mode vs Standard Resolution, RESOLUTION (Mining Museum)

The Olympus OMD E-M5 Mark II produces 9216 X 6912 images (63.7MP) from 105MB raw files when shot in its hi-res sensor shift mode (those dimensions are 2X linear multiples of its 4608 X 3456 native resolution). The EM5 Mark II produces 40 megapixel JPEG images simultaneously (SLF + Raw). When shooting in hi-res mode SLF+RAW format, the EM5M2 produces three files:

The huge ORF file has nowhere near the detail its 64 megapixels imply, so the question is how much it really offers over the standard resolution file. The Olympus position is that it offers up to about 40 megapixels of detail under ideal conditions; hence the 40MP JPEG that is output. This is an optimistic upper bound; the true gains depend on lens performance, focus accuracy and depth of field, losses from diffraction, etc. Even if resolution gains are modest, there can be benefits to oversampling in that digital artifacts are diminished.

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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.

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  • 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 28 megapixels filling up to 5K display, 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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Variants Hi Res, Standard Res available in full article
f4 @ 1/10 sec, ISO 200; 2015-03-09 12:36:40
E-M5MarkII + LEICA DG SUMMILUX 15/F1.7 @ 31.2mm equiv (15mm)

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