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Do you think that street light was making it into the top end of your newt and hitting the secondary Stéphane? I'm not sure what your setup looks like, but a light baffle might do the trick if you're not already using one (or make sure that your existing light baffle is long enough / positioned correctly if it's a partial baffle). Likewise for the bottom end of your newt - you might need to seal it from off axis light entering from behind the primary.
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