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article by Henryk Szubinski
the SDSS and its special focal mechanism could define the sloan as 3D tour type
by the proximal blur at the edges as well as defining 3 of the corners of its square
to locate by reductions of glare and blur by searching for similar types of effects
and track them to their source
basically the effect you get when youre using a glare shielded lens apparatus applied to the larger focal lens
there will be some glarge or fuzzyness on the edges.
basic dark matter effect of time dialation in the universe with its own type blur.