What is the cause of camera overexposure?

The problem of photometry. And D5 100, preferably with an aperture smaller than 8. It's very easy to overexpose if you check it. Outdoor novices are easily overexposed. I have been overexposed before. Even the matrix is the same, the main problem is that the focus is very dark relative to the sky, and the difference in light ratio between the two is indeed a bit large. It is necessary to buy a piece of GND0.9, because you don't have a reflector to fill the light like other photo studios. Or no one else's landscape photographer has time to shoot. I guess you took it in broad daylight. Maybe you took it against the light. You go straight back to the bedroom, close the curtains, turn on the lights, and shoot directly at the light bulb. As far as light bulbs are concerned, the exposure is basically accurate. It is most correct to send a little green. Then the matrix opens and starts to look like the ceiling, and the edge of the light bulb is overexposed. Central key photometry has little practical significance.