The student detaches the lens.
text: Detach the camera lens.
text: Left hand, hold the black button and right hand turn the red mark.
text: Right hand. Turn
text: Don't press anything. One hand press the black button.
text: Where's the black button?
text: Under the lens.
text: What?
text: There's a EOS mark on the camera kit.
text: Hm.
text: The other side.
text: Yes, there is a black button.
text: Yes.
text: Press and hold it, the other hand turn the red mark and attach to the back.