I thought I had written out my workflow in the past but I cannot find it to upload.
So I just jotted down a few things as above, thinking it might help.
There is a great deal more detail to this subject to be understood though.
For example
I think that you may not be able to stitch DNG and/or RAW files directly because, they are data files, rather than image files. You first need to convert the DNG and/or RAW files.
I have used both "Adobe Digital Negative Converter" in the past and "
RawTherapee".
I found
RawTherapee to be better than Adobe Digital Negative Converter for bulk convertion but I may have had the wrong settings.
DNG is an Adobe format so you would have thought that Adobe Digital Negative Converter would have been better.
Anyhow use either .jpg originals or the converted files and stitch using
MS ICE or other stitching software.
The chances of getting a stiched image of 2:1 ratio is extremely rare so the resultant image needs to be resized to have a height of half the width.
I use GIMP to
resize the canvas but there is still a blank sky.
You can now view this as a panorama using RICOH THETA.
I then fill the sky using
SkyFill, or add a mirrored sky.
View attachment 172927
View with RICOH THETA or other pano viewer.