||This article may be too technical for most readers to understand. (June 2013)|
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The Perceptual MegaPixel (P-MPix) is a proprietary ranking of lens-camera combinations, created by DxO Labs. It is intended to express the resolution a camera produces when paired to a particular lens. Complete scientific or technical documentation of the process used to compute P-MPix values has never been published, and P-MPix measurements been never been made without the cooperation of DxO Labs. The name of the measurement is a trade mark.
The P-MPix meant for photographers to consider when comparing the sharpness of a lens-camera combination. The P-MPix has been praised as being a more accurate and relevant value for photographers to consider when weighing-up camera sharpness.
As of January 2014, the Carl Zeiss Distagon T* Otus 1.4/55 ZF.2 lens mounted on a Nikon D800 along with the Sony Zeiss Sonnar T* FE 55mm f1.8 ZA mounted on the Sony Alpha 7r have the highest measured P-MPix. However, with ratings of 29 P-MPix, they are still 20% below the theoretical maximum of the camera's 36.3 MP image sensors.
- http://news.cnet.com/8301-17938_105-57559599-1/dxo-labs-tries-making-sense-of-camera-lens-sharpness/ DxO Labs tries making sense of camera lens sharpness
- http://www.dxomark.com/index.php/Lenses/Camera-Lens-Ratings/Optical-Metric-Scores Camera Lens Ratings by DxOMark