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A little bit of Subaru

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I am not sure how ha filters work but it seems to me that it could be because the none ccd face of the filter

is not blocking the light as well as the ccd face( just a guess as it might not even be possible for that to be the case).

So the light comes through the filter and some is reflected off the ccd cover slip and when it hits the ccd face of the filter on its way back out it's blocked and bounces back on to the ccd as a halo.

I might try turning the filter in its cell one day to test the theory.


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