Interesting thread. Sadly I don't have a Hasselblad scanner ( I would like one). So from what I deduce from this thread is that not all .fff files are created equally. .fff files converted via Phocus from 3FR are clearly not the same thing as .fff files created initially by the scanners.
Changing the subject slightly, I have never understood the relationship between 3FR files and the .fff files which are generated by Phocus...
• .3FR files are what always get written to CompactFlash (CF) cards. They were written with lossless compression in the past, but have not used compression for some time. I don't know why that changed. When these are processed with Phocus, they are first imported and converted to FFF (.fff) files. FFF files all use lossless compression. Other programs like Lightroom work directly with 3FR files, but Phocus always converts them first into FFF files.
• Phocus only uses FFF files because it maintains a complete detailed history of every saved adjustment made to any Hasselblad camera image. The adjustment history is contained
inside each FFF file. The Phocus history browser is a versatile tool with a variety of functionality worth exploring. It's unfortunately often overlooked and some users may not even know that it's there. The adjustment history file always stays inside an FFF image and there are no separate sidecar files as with other raw formats. This is not possible with 3FR files which are read-only files, like other raw formats.
• If you shoot tethered, FFF files are always generated. Again, FFF files always use lossless compression. Multi-shot is always tethered and therefore are FFF files. Multi-shot files are supported by few (if any) programs other than Phocus.
• Scanner files are also always tethered with the option of being saved as FFF files with lossless compression and a history file. This is the original FFF (3F) file, before Imacon acquired a digital back product line. These FFF files contain raw scanner data along with a thumbnail image and proprietary data tags which can be read, to the best of my knowledge, only in Flexcolor software. They don't open in Phocus. As they use TIFF format as a container for the data, you can change the file name and use them as a TIFF.