Originally posted by Ole Strange indeed. As an example the lens name always get wiped for me when I save the file as jpg from PS. That's annoying and therefore I have turned to save all EXIF data with Photobrowser as the second step in my process (after renaming the files).
Are you sure?
I just opened an *ist DS PEF file in ACR 3.6, choosed Open and it came up in Photoshop CS2, then I changed the file from 16 to 8-bit format, converted it to sRGB and saved it as JPG and closed it. When re-opened in CS2 I press Ctrl+Alt+Shift+I and in Camera Data 1 the lens name is preserved.
Reopening the same JPG in Bridge (v 1.0.4.6) and checking the Metadata tab, EXIF section, also shows the lens name.
All the above is, as said earlier, with the DS. I have no idea about how ACR/CS2/Bridge handles the K100D files.
regards,