Dynamic range
From our testing and measurements using DxO’s testing methods we believe the maximum dynamic range to be around 12.5EV, which is in keeping with most recent DSLRs. The 645D also boasts methods for extending the dynamic range in the form of its dynamic range expansion and HDR settings. The dynamic range expansion offers either high illumination or low illumination for highlight or shadow priority. This works well to produce a nice subtle effect on JPEG images. The HDR mode will take three images in quick succession and combine them in-camera with either a standard or strong effect, although the strong is best avoided for any serious work.
Image: The dynamic range expansion offers high or low illumination for lifting either highlights or shadow
