Nikon PC-E Micro NIKKOR 85mm f/2.8D Manuel De L'utilisateur page 30

12. Taking flash pictures using cameras with a
built-in flash
To prevent vignetting, do not use a lens hood. Moreover take
pictures at a shooting distance of 0.6 m or further.
En
Note: When using the camera's built-in flash for tilt/shift shooting,
vignetting will be greater than shooting without tilt/shift. For
tilt/shift shooting, use of camera's built-in flash is not
recommended.
30