Can I stitch RAW images?

No, you can’t. 3DVista Stitcher is stitching software, not RAW decoding software. If it would allow RAW images as input, it would have to decode the RAW files with default values, which would render the whole purpose of RAW shooting useless. Therefore, we advise you to treat your RAWs in dedicated editing software, such as Lightroom, before importing them to 3DVista Stitcher.