@anubis I tried hdrmerge with your images. One problem with your files is, that there is no information about aperture in exif. This leads to some NAN values in processing the files. The aperture value normally is used to identify the EV of the raw files (there are cameras which change aperture while bracketing). But for your case (no aperture value or aperture 0) I can try to use a dummy value (2.8 for example) instead. I’ll create an issue and see what I can do tomorrow. Today it’s still too hot here in Germany to do serious work…
Ingo