Another aspect of the wide dynamic range enabled by the DinionXF's XF-Dynamic feature is that it offers an important advantage over the alternative "dual-exposure technology" used in other security camera systems. Here, a long exposure of approximately 1/50 sec (for PAL) accumulation time or 1/60 sec (for NTSC) is used for the dark areas of a scene, and a short exposure of approximately 1/1000 sec or less is used for the bright areas. A "smart" combination of these two exposures is then made. In principle, this should have the best of both worlds, accentuating all scene details without overexposure of highlights. In practice, the optimal combination is difficult to achieve, and compromises, especially at the changeover between light and dark scenes, may result in less than optimal exposure and degraded picture quality.
