In the past few years, mobile phone manufacturers were competing to see who could shoot farther. A mobile phone that did not have a 10x telephoto was too embarrassed to release it. But by 2023, mobile phone manufacturers have quietly "shrunk", and more and more new mobile phones have "shrunk" to 3x or 5x small zoom. Why has mobile phone telephoto "regressed"? What problems does it have? Why is the telephoto picture quality on mobile phones so poor?

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