Why is my Samsung NX1000 suddenly overexposing photos in A/S modes?
Asked 8/30/2015
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2 answers
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My Samsung NX1000 has recently started badly overexposing photos, especially outdoors. To get usable results I need around -3 EV exposure compensation. This happens in Aperture Priority and Shutter Priority mode.
I’ve tried very small apertures and fast shutter speeds, but exposures are still blown out. Example EXIF from one image: 24mm, f/22, 1/60s, ISO 200, Shutter Priority, exposure compensation 0.
A year ago the lens was damaged and later repaired by a camera shop. It seemed fine after the repair, so I’m wondering whether this is a camera setting issue or a lens problem. What should I check first?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
10y ago
2 Answers
3
I notice an unsharp region in the lower right of the frame. At f/22, i wouldn't expect that, but the image doesn't lend itself very well to judge DoF.
I assume your lens doesn't adjust aperture correctly as commanded by the camera. Try to set it to its widest value in aperture priority and shoot with the calculated exposure time. If this comes out ok, the lens is simply defect.
Originally by user32110. Source · Licensed CC BY-SA 4.0
user32110
10y ago
0
Generated from our catalog & community — verify before relying on it.
First check settings before assuming a hardware fault.
In Aperture or Shutter Priority, the camera still chooses part of the exposure, and metering mode strongly affects that choice. If you’re using spot metering and the meter is reading a dark part of the scene, the rest of the image can blow out. Try switching metering modes and confirm exposure compensation is really at 0.
Also check ISO, since auto exposure modes may raise it if allowed.
That said, your example is suspicious: at f/22 outdoors, 1/60s at ISO 200 is far brighter than expected. Combined with the history of lens damage/repair, that points to the lens aperture possibly not stopping down correctly when commanded. A quick test is to compare shots at wide open vs. small apertures in Aperture Priority and see whether exposure changes as expected. If images stay too bright or depth of field doesn’t match the selected f-stop, the aperture mechanism may be defective.
If settings look normal, test in Manual mode to verify exposure behavior, then have the lens checked again.
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