What is DxOMark?

About DxOMark | DxOMark unique features | Test result reliability

DxOMark consists of a comprehensive RAW-based image quality measurement database and a set of scores used to evaluate and compare digital cameras and lenses.

A unique Measurement Database:

  • All measurements are performed on straight-from-camera RAW files, the only reliable way to evaluate intrinsic hardware performance. Read more.
  • All lenses are tested on every camera on which they can be mounted. Read more about how camera sensors impact the optical performance of lenses.
  • Lenses and cameras are tested for their full range of possible settings such as focal length, aperture, exposure time, ISO speed, white balance, etc.
  • To ensure highest precision and reliability, measurements are performed at DxO Labs’ dedicated testing laboratories, where conditions are controlled as in standard metrology labs. Read more.
  • To ensure that measurements for all lenses and cameras can be reliably compared, we have developed detailed protocols that are systematically repeated for all equipment we test. These protocols are detailed on the site so that anyone interested in performing measurements can do so. Read more.
  • We test commercial products: in other words, we buy or rent lenses and cameras from the very same retailers that consumers use. When we do test pre-production models (when commercial products are not yet available), we clearly indicate this on our site, and we retest those models when they become commercially available.
  • Finally, DxOMark has no ties to or interests of any sort with camera or lens manufacturers, which means that we are completely independent from them.

DxOMark Scores for ranking and comparison of cameras and lenses:

  • The DxOMark Measurement Database is so large and exhaustive that comparing or selecting camera or lens for specific needs could prove difficult without appropriate tools. Accordingly, we have defined a set of fifteen DxOMark Scores to faciliate easy ranking and sorting.
  • The DxOMark Scores are designed based on the following photographic use cases: Travel, Portrait, Sport, Landscape, and Reportage. Read more about the five use cases for scoring lenses or the four use cases for scoring camera sensors.
  • To design DxOMark Scores, we have made choices about our photographic use cases and their associated image quality requirements (such as resolution, distortion, noise, dynamic range, etc.). It is clear that other photography experts may see things differently. We are very open on this site about the choices we have made so that anyone interested in creating a different scoring system can do so based on their own analysis of our DxOMark Scores and Measurement Database.