| 词条 | Perceptual MegaPixel |
| 释义 |
The Perceptual MegaPixel (P-MP) 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-MP values has never been published, and P-MP measurements have never been made without the cooperation of DxO Labs. The name of the measurement is a trade mark. The P-MP meant for photographers to consider when comparing the sharpness of a combination of camera and lens.[1] DxO Labs claims that P-MP is a more accurate and relevant value for photographers to consider when weighing-up camera sharpness.[2][1] As of March 2017, the "Canon EF 300mm f/2.8L IS II USM" lens mounted on a "Canon EOS 5Ds R" has the highest measured P-Mpix value in the DxO Labs lens database, a value of 44.7.[3] On the lens' summary pages this figure is rounded to an integer value of 45 P-Mpix[4] References1. ^1 {{cite web|url=http://news.cnet.com/8301-17938_105-57559599-1/dxo-labs-tries-making-sense-of-camera-lens-sharpness/ |title=DxO Labs tries making sense of camera lens sharpness |year=2012|publisher=cnet.com|archive-url= |archive-date= |access-date=16 January 2019 }} {{Photography}}2. ^{{cite web|url=http://petapixel.com/2012/12/17/perceptual-megapixel-mtf-charts-boiled-down-to-a-single-number |title= Perceptual Megapixel: Lens Sharpness Boiled Down to a Single Number|year=2012|publisher=cnet.com|archive-url= |archive-date= |access-date=16 January 2019 }} 3. ^{{Cite web|url=https://www.dxomark.com/lenses/launched-between-1987-and-2017/focal-from-1-to-1500/aperture_max-from-0.95-to-45/amp;viewMode-list/amp;yDataType-global/launch_price-from-0-to-13000-usd#hideAdvancedOptions=true&viewMode=list&yDataType=rankDxo|title=Camera Lens Database {{!}} DxOMark|last=DxO|website=www.dxomark.com|language=en|access-date=2017-03-22}} 4. ^{{cite web|url=https://www.dxomark.com/Lenses/Canon/Canon-EF-300mm-F28L-IS-II-USM-mounted-on-Canon-EOS-5DS-R__1009 |title= Canon EF 300mm f/2.8L IS II USM mounted on Canon EOS 5DS R : Tests and Reviews|year=2012|publisher=cnet.com|archive-url= |archive-date= |access-date=16 January 2019 }} 1 : Photography |
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