The student disassembles the lens.
text: This is the lens cover, please attach it again.
text: Detach the lens, you need to press the black button which is located at the front of the camera,  you are facing now.
text: The button you need to press is located at the camera body.
text: Yes, that's correct.
text: And then you need to rotate at the same time.
text: Very good.