With some tripods and lenses, the Extension Scales Knobs, frame or the
Extension Scale may hit the tripod mount. If you encounter this situation,
turn the Bellows Lens Hood upside down, but be sure that it is correctly
aligned with the camera, Fig. 4.
If you use the Bellows Lens Hood in an upside down position, and you are
using the 150mm, 210mm or 300mm f/5.6 lens, insert the Telephoto
Lens Mask from the reverse side of the Bellows to prevent it from
dropping out of the frame.
