To score lenses in a way that makes sense from a photographic perspective, we have chosen to evaluate them using a set of 5 common photographic use cases, each with its own use case score: Travel & Family Score, Portrait & Studio Score, Sports & Wild-life Score, Reportage Score, and Landscape & Architecture Score.
In addition to covering the entire photo-space with respect to focal lengths and aperture ranges, we have defined performance criteria for 5 key lens metrics for each use case: resolution, distortion, vignetting, transmission and chromatic aberration. And for each of these performance metrics, we indicate the threshold to gain one star. A lens can thus receive up to 5 stars for each use case.
Overview of DxOMark use case requirements:
Lens Use Case Details and Scoring Criteria:
Travel & Family
When traveling or enjoying family events, the shooting opportunities are quite broad both indoors and out: landscapes, portraits, group shots, close-ups when sightseeing; and the field of view requirement is very broad, from wide-angle to long telephoto. For this type of use, photographers typically look for a high-power zoom with a good trade-off between all image quality parameters.
The image quality criteria to consider for this use case are:
At least 2.9X zoom within a large focal range (24–300mm equivalent)
Transmission sufficient to achieve a t-stop better than f/4
Reasonable lateral chromatic aberration (10 µm or less on 24x36 mm)