A series of night shots show this abrupt change of brightness: It starts at approximately 60% horizontal and extends to the right corner.

I didn't notice this effect before, the temperature was around 32°F (0°C).

In daylight this doesn't happen what could be the reason?

enter image description here

  • This would be an indication of the shutter sticking as it travels. – Mike Dixon Jan 20 '19 at 12:19
  • @MikeDixon Thanks for this idea, the shutter moves vertical the effect described is horizontal. – stacker Jan 20 '19 at 15:41
  • What is the specific camera in question? – Michael C Jan 20 '19 at 17:35
  • @MichaelC Sony A7RII with Tamron 70-300 (with Canon Adaptor) – stacker Jan 20 '19 at 19:09
  • 1
    Are there any filters on the front of your lens? – Michael C Jan 21 '19 at 1:09

I suspect you are shooting through a window and the difference in brightness is caused by the reflection of a curtain or vertical blinds.


  • Thanks for your answer, the shots were made outdoor. But it could be that a light source was partially blocked by a steel construction. – stacker Jan 21 '19 at 12:48
  • If I think of anything else, I'll revise my answer. – xiota Jan 21 '19 at 22:54

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