I've often found it challenging to shoot HDR images in forests, where there may be strong contrast between sky and trees. One issue I've noticed, even when covering the full dynamic range of the image, is a haze-like effect around some of the trees (see images below). Almost like light is spilling around the tree. Does anyone know what causes this effect (diffraction?), and possible solutions?
this 7-photo composite was shot at f/6.3, 17mm, ISO100