Is the DxO One the perfect camera upgrade for iPhone users? Andy Westlake finds out.
DxO One review – Lab Results
We have tested lots of cameras that use the Sony 20.2-million-pixel, 1in sensor over recent years, and the DxO One gives image quality that matches our expectations for this unit. At low ISO sensitivities it produces highly detailed images with decent dynamic range and no visible noise; for the very best results I’d keep the sensitivity at ISO 800 or lower. Step up to ISO 1,600 and 3,200 and images are still very usable, although it should be noted that fine detail does start to suffer visibly. Higher ISO settings aren’t so great, though: I would be happy using ISO 6,400 and perhaps ISO 12,800 for casual web use and small prints, but the extended settings push this sensor too far, and only really give usable results with DxO’s multi-shot SuperRaw mode. But it’s also worth remembering that with the fast f/1.7 lens, such high ISO settings aren’t needed all that often anyway.
Lab Results – Dynamic range & resolution
We’re accustomed to seeing fine results from the 20.2-million-pixel, 1in sensor in our Applied Imaging tests, and in the DxO One it behaves as well as ever. Dynamic range is excellent through to ISO 400, but starts to fall more quickly at higher settings. By ISO 3,200 we register just 7.5EV, which is rather marginal and indicates loss of shadow detail. The higher settings give poor results, with sub-6EV readings at the top two ISOs rendering them barely usable at all, at least in conventional single-shot-capture mode.
At low ISO sensitivities, the DxO One resolves around 3,200l/ph, which is about as high as we’ve seen from this sensor, and confirms the quality of the lens (we shot our resolution test chart at f/2.8). Resolution falls slowly as the sensitivity is increased, dropping to around 2,800l/ph at ISO 1,600 and 2,500l/ph at ISO 6,400, which is still quite respectable. Beyond this, noise has a serious impact on recorded detail, with just 2,000l/ph registered at ISO 51,200, even with our high contrast black and white test chart.