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I suggest you post it in the Nikon forum. You might want to include a full-frame shot as well as the close-up so folks can see exactly what was in the frame.
The possibities that come to mind for me are the following:
- "Amp glow". Some of the Nikon cameras have been reported to have this problem on long exposures where the electronics cause some fogging of the image. The particular form of the artifact in your case doesn't really make me think it might be amp glow and I thought I read that the 810 was supposed to be better in that regard anyway, but I'm just throwing it out there as a possibility.
- Reflection off the sensor. UV filters with poor multi-coating will sometimes causes this. The light bounces off the sensor, reflects back from the filter and ends up in the image. Again, can't say that is what is happening here. This is one reason it would be good to see the whole frame. If it is reflection off the sensor, you can often match up the reflection to a bright object in the frame. Sometimes it will be inverted and on the other side of the frame from the bright object.
- Interaction between the polarizer and the ND. I assume the ND wasn't one of those vari-NDs because those could definitely interfere with the polarizer but there still might be some kind of interaction with a normal ND. Again, just guessing here.
Try the Nikon guys. They should be able to give you good feedback on the probability of the amp glow problem being the cause. Another thing you should mention is what exposure settings you used - the exposure time in particular.
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