Well, it sounds easy problem but can we do it without pointing the camera to a faraway place? How does the manufacturer do this during mass production? Is there any focusing machine?
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1use a corrective lens perhaps – jsotola Sep 23 '21 at 23:06
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you are right. I just put a magnifier in front of the lens and solved the problem. – Chanoh Park Sep 26 '21 at 10:13