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I am having an issue with my camera. At random, it will overexpose photos during interval timer shooting. It's generally fine at the beginning, but as time goes on, there are more and more overexposed shots. The time on those shots is the same as on the ones that are properly exposed.

I am thinking that either the aperture is not being set properly on the lens, or the shutter is broken.

How can I diagnose this so that I can know if I need to get anything fixed? (It never happened when I was taking pictures normally).

Here's my last timelapse, you can see the overexposed shots:

enter image description here

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  • \$\begingroup\$ Have you consider to take photos in Manual mode? \$\endgroup\$
    – Romeo Ninov
    Apr 23, 2021 at 11:49
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    \$\begingroup\$ What shutter speed? What lighting source? What exposure mode? \$\endgroup\$
    – BobT
    Apr 23, 2021 at 14:52
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    \$\begingroup\$ "The time on those shots is the same as on the ones that are properly exposed." Is the amount of light the same??, One would assume not. (It probably has nothing to do with randomness) \$\endgroup\$
    – Alaska Man
    Apr 23, 2021 at 17:48
  • \$\begingroup\$ Manual or auto mode? what lens? Is the exif/exposure data the same in all images? And more important: was the light source a continuous one? or maybe a neon light with a frequency of oscillation? \$\endgroup\$
    – vsis
    Apr 23, 2021 at 19:21
  • \$\begingroup\$ If the light source "blinks", e.g. LED or fluorescent lamps, you might capture light from two blinks on occasion, and from one others. \$\endgroup\$
    – DrMoishe Pippik
    Apr 26, 2021 at 0:09

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