Introduction
Follow these steps below if the Sony Alpha 5100 doesn't recognize the lens and displays an error message on the screen of your camera. You can follow this guide to reinsert a new lens to your camera. No tools are needed for this guide.
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Place the camera in front so the lens is facing you. There should be a small button on the bottom left side of the lens.
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While holding down the button with your left thumb, use your right hand to twist the lens counterclockwise.
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Conclusion
To reassemble your device, follow these instructions in reverse order.