The student is detaching the lens of the dslr camera.
text: To detach the lens, please use the lens button on the right side of the front of the camera.
text: The button is currently being hidden by the strap.
text: To detach the lens, please press the 
black lens at the button
text: Please move the camera downwards.
text: Thank you very much.
text: The button will be in front of the camera.
text: The button will be to the right for the front side of the camera underneath that.
text: Please put the lens cover back on.
text: In the front of the camera to the right you will see text EC in white underneath the task. EOS in white, in the middle text there's a button.