A dual power switch system and the related control method thereof. The dual power switch system includes: a power supply module for supplying power to the dual power switch system; a first power switch circuit, electrically connected to the power supply module, for generating a first control voltage to trigger the power supply module to supply the power; and a second power switch circuit, electrically connected to the power supply module, for generating a second control voltage through magnetic induction to trigger the power supply module to supply the power.

 
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> Collapsible lens barrel and optical instrument using the same

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