No that isn't what Linhof does.
Linhof (and Sinar) both purchased a Rodenstock manufactured Siemens Star projector (a huge floor standing thing that moves on rails). The lens is first examined in a dark box with an indirect light in it to check for particles, bubbles or other things in the glass and between the elements of the lens. If found they try to clean them out before proceeding further with testing. If they can not be cleaned out the lenses are returned to the Schneider or Rodenstock factories. The lenses that pass are then checked for shutter speed accuracy. Those that fail are adjusted or returned. The passed lenses are then mounted in the Rodenstock projector that projects Siemens Star patterns on to a large wall. An examiner stands by the wall and examines the patterns projected. He has a remote control in his hand that allows him to rotate the lens in the projector. By watching the formation and patterns of Siemens Stars he can detect problems with the lenses within the field area that the lens is capable of covering.
Some lenses that test particularly well for a certain format (say 617 or 612) are reserved for use on Technorama cameras. These lenses that are spectacular performers on the panoramics might not be the best for a 4x5 or 5x7 camera. But since they perform particularly well within the required panoramic area they are put aside for those cameras.
The rest of the lenses, after passing, are then silk screened on the front or rear element with the Linhof logo and are re-packaged for sale as a taking lens. They are not matched to a specific body or camera type.
Lenses that fail the projector test are returned to the manufacturer.
Note that all lenses tested have already passed the lens manufacturer's QC tests before they are sent out to Linhof.
And the premium is well above 10%.
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