crwdns2935425:031crwdne2935425:0
crwdns2931653:031crwdne2931653:0
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The circled nubs follow the tracks on the inside of the housing, translating rotation into linear motion extending the lens outwards.
crwdns2944171:0crwdnd2944171:0crwdnd2944171:0crwdnd2944171:0crwdne2944171:0