In seinem Blog zeigt Gary Friedman auf, daß Sony beim Design der Sony Cyber-shot DSC-RX100 erhebliche Kompromisse in Bezug auf das optische Design des Objektivs eingehen mußte, um ein solches Objektiv in einer Kamera dieser Größe unterbringen zu können. Möglich wurde dies nur durch einen anderen Denkansatz, nämlich den, daß man viele Abbildungsfehler auch später in (platzsparender) Software korrigieren kann, sofern man sie genau kennt. Die sich aus dem Kompaktdesign ergebenden überaus starken Abbildungsfehler des Objektivs werden bei der DSC-RX100 so in der Software korrigiert, daß normale Anwender davon in der Regel gar nichts mitbekommen. Eine Beschreibung der notwendigen Bearbeitungen wird auch im diesbezüglich erweiterten Raw-Format hinterlegt, so daß Raw-Konverter diese ebenfalls anwenden können - und da die Korrekturen so massiv sind, um zu einem akzeptablen Bild zu kommen, sind diese in der Regel auch gar nicht mehr abschaltbar.
http://friedmanarchives.blogspot.de/2012/1...zeiss-lens.html
ZITATLike other late-generation Sony cameras, the RX-100 employs Lens Correction algorithms in its .JPG engine designed to correct for distortion, vignetting, and chromatic aberration in lenses whose optical blemishes were well-understood. In the past it was used to correct mild flaws in existing lenses, but this is the first time I've ever seen an optical team give themselves permission to make a sloppy design, knowing that it can be fixed in software later. They went this route because there was no other way to make a perfect conventional zoom lens with that much reach that could collapse so much. [...]
Most RX-100 owners who try this same experiment at home will likely never notice this horrid distortion, because Sony also did something very clever to keep you from seeing it: they re-defined their RAW file format to include lens correction attributes in the EXIF information. Recall that when a camera shoots RAW, it just pulls the pixel values from the sensor and writes them straight to the memory card. In addition to that, it takes note of other settings that camera was set to (like white balance, sharpness, contrast, color space etc.) Mind you, these settings are not applied to the image data - they're merely a footnote in the RAW file: "Oh, by the way, here's what the camera's settings were". They're there so that high-end RAW processing software like Bibble, DxO, or Lightroom could take note of those settings when opening the RAW file, and automatically adjust the sliders to make it look like what the camera would have produced had it been shooting a .JPG. This being RAW, the user is free to undo all of these initial settings and change all of the values before exporting the final product, but this "write down what the camera settings were, and apply them after de-mosiacing the RAW file" is a huge time-saving convenience for the user.
So what Sony did was extend that concept, making note of all the optical corrections the .JPG engine would have made and write them to the RAW file. That's one reason why none of your legacy software can open an RX-100 RAW file. Lightroom 4.2 RC is the first program I know of (other than Sony's own IDC software) that is aware of these new distortion correction fields and applies them mandatorily. [...] You can't disable it. (At least not in Lightroom![/quote]
Viele Grüße,
Matthias