@Morgan_Hardwood : Thank you for trying. So my suspicion is correct that the problem is due to the filter combination. A workaround is to use the RAW-converter in PhotoShopElements and convert it to a 16bit-TIF.
By the way, I tried using a DCP from Adobe DNG Converter and it the colors a cyan shade of green. Perhaps it inverted some channels. It looked bad, but maybe that’s a clue. Though I don’t expect anyone to spend time investigating an arcane, old and dead format.
Sony F828 is not supported correctly in RT. This is also the case for some other old Cameras (like Nikon D1x for example). As I have thousands of D1x raw files on my storage, I would like to solve the D1x issues before the F828 issues.
But of course if someone is willing to solve the F828 issues, I won’t have objections
thanks for all the feedback. With a workaround available there is, to my opinion, no high priority. I was just curious, if I made a mistake. The use of raw format with this camera is also hampered by the fact that storage time is very long.