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Rocolax UVIR-cut filter replacement arrived yesterday, I tested it with spectrograph and it turned out it is almost exacly the same as previous one...
So, most likely this problem I have is not about manufacturing quality but rather it is because distributors do not really know what they are selling...
After some more googling, it seems that this filter (with cutoff at 650nm) is pretty standard...
It seems there are two other cutoff wavelengths set at 700nm and then 800nm...
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