Thanx, i just copied the exiv2 command from somewhere. Now i iknow the t option means human readable format. But changing to
[nikon]
241=Tamron SP 70-300mm F4.0-5.6 Di VC USD (A005)
does not help.
Do i need to install exiv2 besides the darktable version? If so i think i will stick with the Preset or try the lua script i found somewhere in this forum to fix misinterpreted lenses