Case
![](/library/CANON/CITS_TECH_SUPPORT/Camera/Lenses/EF%20400mm%20F2.8L%20IS%20III%20USM/case1.png)
Attach all cushions inside the case as shown.
![](/library/CANON/CITS_TECH_SUPPORT/Camera/Lenses/EF%20400mm%20F2.8L%20IS%20III%20USM/circle1.png)
Cushion (U-shaped)
*1 x1
![](/library/CANON/CITS_TECH_SUPPORT/Camera/Lenses/EF%20400mm%20F2.8L%20IS%20III%20USM/circle2.png)
Cushion (square, small) x2
![](/library/CANON/CITS_TECH_SUPPORT/Camera/Lenses/EF%20400mm%20F2.8L%20IS%20III%20USM/circle3.png)
Cushion (square, large) x1
![](/library/CANON/CITS_TECH_SUPPORT/Camera/Lenses/EF%20400mm%20F2.8L%20IS%20III%20USM/circle4.png)
Cushion (round)
*2 x1
*1 Attach
![](/library/CANON/CITS_TECH_SUPPORT/Camera/Lenses/EF%20400mm%20F2.8L%20IS%20III%20USM/circle1.png)
where it holds the drop-in filter area of the lens.
*2 ![](/library/CANON/CITS_TECH_SUPPORT/Camera/Lenses/EF%20400mm%20F2.8L%20IS%20III%20USM/circle4.png)
is attached to the bottom of the case.
![](/library/CANON/CITS_TECH_SUPPORT/Camera/Lenses/EF%20400mm%20F2.8L%20IS%20III%20USM/warning.png) |
- Before stowing the lens, be sure to attach all cushions inside the case.
- The lens should always be stowed in the proper way.
|
Proper Way to Stow the Lens
![](/library/CANON/CITS_TECH_SUPPORT/Camera/Lenses/EF%20400mm%20F2.8L%20IS%20III%20USM/1.png) |
Attach the dust cap on the lens. |
![](/library/CANON/CITS_TECH_SUPPORT/Camera/Lenses/EF%20400mm%20F2.8L%20IS%20III%20USM/2.png) |
Reverse the lens hood, slip it over the lens, and then attach the lens cap. |
![](/library/CANON/CITS_TECH_SUPPORT/Camera/Lenses/EF%20400mm%20F2.8L%20IS%20III%20USM/3.png) |
Place the lens in the case, with the tripod mount closest to you and facing the left as shown. |
![](/library/CANON/CITS_TECH_SUPPORT/Camera/Lenses/EF%20400mm%20F2.8L%20IS%20III%20USM/4.png) |
Fasten the lens securely with the strap. |
![](/library/CANON/CITS_TECH_SUPPORT/Camera/Lenses/EF%20400mm%20F2.8L%20IS%20III%20USM/5.png) |
Pull the fastener and close the lid. |