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mattdm
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What is this bright squarish pattern that I'm getting in long exposure images?

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I took few long exposures of the night sky yesterday. I know about the hot pixels those appear brighter with longer exposures but this seems to be something different. Can anybody tell what it is?

  And this is at same position in every image and that too only in long exposure shots. hot pixel or other artefact

I took few long exposures of the night sky yesterday. I know about the hot pixels those appear brighter with longer exposures but this seems to be something different. Can anybody tell what it is?

 hot pixel or other artefact

I took few long exposures of the night sky yesterday. I know about the hot pixels those appear brighter with longer exposures but this seems to be something different. Can anybody tell what it is? And this is at same position in every image and that too only in long exposure shots. hot pixel or other artefact

I took few long exposures of the night sky yesterday. I know about the hot pixels those appear brighter with longer exposures but this seems to be something different. Can anybody tell what it is?   

enter image description herehot pixel or other artefact

I took few long exposures of the night sky yesterday. I know about the hot pixels those appear brighter with longer exposures but this seems to be something different. Can anybody tell what it is?  enter image description here

I took few long exposures of the night sky yesterday. I know about the hot pixels those appear brighter with longer exposures but this seems to be something different. Can anybody tell what it is? 

hot pixel or other artefact

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