The zoom ring can be locked to fix the lens at the shortest setting. The function is convenient for carrying a camera on a strap because it prevents the lens from extending.
![](/library/attachments/ServiceWareImages/LDImages/SolutionAnswer/EF_70_300_DO/lenslock01.gif)
![](/library/attachments/ServiceWareImages/LDImages/SolutionAnswer/EF_70_300_DO/lenslock02.gif) |
1. Turn the zoom ring to the widest position (70mm).
- The zoom ring can only be locked at the maximum wide angle.
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![](/library/attachments/ServiceWareImages/LDImages/SolutionAnswer/EF_70_300_DO/lenslock03.gif) |
2. Slide the zoom ring lock level in the direction indicated by the arrow.
- To release the zoom ring, slide the zoom ring lock lever in the direction opposite to the arrow.
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