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The Fujifilm X-Pro2 offers both uncompressed and lossless-compressed raw format. Both formats are equal in quality, but the lossless-compressed format saves substantially on space usage.
Uncompressed raw format
File sizes in uncompressed raw (RAF) format are a whopping 50.1 MB. At 14 bits per pixel, 24M * 14/8 = 42 megabytes for image data alone (uncompressed). The remaining 8MB difference indicates that uncompressed raw pixel data is stored as 16-bit values with the two high order bits as zeroes: 24M * 16/8 = 48MB. Metadata and embedded JPEG add a few more megabytes.
With savings of 20% to 50%, the lossless-compressed format is much more appealing in storage terms—see discussion below.
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Diglloyd Guide to Mirrorless is by yearly subscription. Subscribe now for about 25 cents a day ($90/year).
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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.
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- 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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