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What causes the lens of the camera to extend or retract

What causes the lens of the camera to extend or retract-example-1

2 Answers

6 votes
Usually it's the control in the camera from the turning that causes it to extend or retract.
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User Rusha
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4 votes
you enter playback mode and when the lens retracts back into the camera.
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User Shanmukha
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