How can I fix a Canon EF 50mm f/1.8 STM lens that won't focus beyond 2 meters

1. Check for Physical Damage

Inspect the lens for any visible signs of damage, particularly around the focusing mechanism. If the lens has been dropped or knocked, the internal components might be misaligned.

- Bending: Look for any parts that appear bent or misaligned. If you notice any, gently try to realign them. However, be cautious as improper handling can cause further damage[1].

2. Clean the Contacts

Sometimes, autofocus issues can be caused by dirty contacts between the lens and the camera body.

- Cleaning: Use a clean, dry cloth or a rubber eraser to gently clean the electrical contacts on both the lens and the camera body. Ensure no debris falls into the lens or camera during this process[2].

3. Test Autofocus in Different Conditions

- Lighting Conditions: The lens may struggle to focus in low light. Test the lens in brighter conditions to see if the autofocus improves. If the lens works well in good lighting but struggles in low light, this could be a characteristic of the lens rather than a defect[2][3].

4. Check Camera Settings

Ensure that your camera settings are appropriate for autofocus:

- Focus Mode: Verify that the camera is set to the correct autofocus mode (e.g., One-Shot AF for stationary subjects) and that you are not inadvertently using AI Servo mode, which is designed for moving subjects[2].

5. Manual Focus Test

Switch the lens to manual focus to see if you can achieve focus beyond 2 meters. If manual focus works, the issue may be with the autofocus motor.

6. Firmware Update

Check if there are any firmware updates available for your camera. Sometimes, compatibility issues can be resolved through updates.

7. Professional Repair

If none of the above steps resolve the issue, it may be necessary to have the lens serviced. Canon typically charges around $100 for repairs, which could be a viable option compared to the cost of a new lens[1].

8. Replacement Consideration

Given the low cost of the 50mm f/1.8 STM lens (approximately $100-125 new), if repair costs are high or if the lens is significantly damaged, consider purchasing a new one instead of repairing it[1].

By following these steps, you should be able to diagnose and potentially fix the focusing issue with your Canon EF 50mm f/1.8 STM lens.