How to change the lens quickly without a shoulder strap?

1. Hold the right handle of the SLR with the lens facing down (to prevent dust from entering);

2. Hold the lens near the rear bayonet with your left hand, press the lens bayonet release key with one finger and rotate the bayonet at the same time. Note that Canon and Nikon rotate in different directions;

3. Remove the lens so that the rear bayonet faces upward. Immediately cover the back cover to prevent dust pollution;

4. Loosen the back cover that needs to replace the lens and install the lens. After changing the lens.