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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 of which a combination of camera and lens is capable. 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 combination of camera and lens. DxO Labs claims that P-MPix is a more accurate and relevant value for photographers to consider when weighing-up camera sharpness.
As of June 2014, the Carl Zeiss Apo Sonnar T* 2/135 ZF.2 lens mounted on a Nikon D800E have the highest measured P-MPix. Since Dx0 Labs only report integer values, the score of 36 P-MPix is at the theoretical maximum of the camera's 36.3 MP image sensor.
- 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