Your question is very interesting. Let me explain it using my photography knowledge. The brightness of the photo is related to the amount of light entering per unit time. The larger the aperture (the smaller the f), the more light entering per unit time and the brighter the photo. According to you The saying is that the front and rear cameras are quickly switched and the photo is taken immediately, that is, the exposure time is close to 0 seconds, so when the aperture is fixed, there is less light and the image is dark (I feel like I am on the wrong set).
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Your question is very interesting. Let me explain it using my photography knowledge. The brightness of the photo is related to the amount of light entering per unit time. The larger the aperture (the smaller the f), the more light entering per unit time and the brighter the photo. According to you The saying is that the front and rear cameras are quickly switched and the photo is taken immediately, that is, the exposure time is close to 0 seconds, so when the aperture is fixed, there is less light and the image is dark (I feel like I am on the wrong set).