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The new uvir-cut filter (680nm, from LenOpTec) arrived today.. it looks very good, H-alpha is passed almost un-affected (green plot, compared to Rocolax which is 650nm)
Halos disappeared with this filter... so the problem was caused by IR (between 670-700nm and possibly beyond 1100nm).
Last edited by bojan; 17-03-2017 at 06:57 AM.
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