It's called time exposure or flash over. What happen is the infiltrating light through the pen hole and a long duration will burn shadows into the micro channel plate in the generation 3 image intensifier tube.
These expensive image tubes can be repaired. Contact Itt inc or Vard Inc in Garland, TX. That about it unless you want to buy a new gen 3 image tube. Maybe $1500+. I would call around to other Night Vision Optica companies and see if the have a used gen 3 image tube. There quit a few companies in the USA that work on NV devise. Also, contact ITT and ask them they repair image tubes, maybe! stewbison
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