I received a the new set of ZWO 31mm NB filters. I think I got faults ones. Ha and OIII have a large amount of light leakage at the edges or is that normal.
Anyway can't confirm since I have absolutely no idea which side is camera side. I'm not color blind and I was testing it under white color light (LED) and there is absolutely no difference or similarities which side is the right one. SII is obvious but Ha and OIII they both have exactly the same reflections on both sides and the colors are inverted. There is no purple or gold color like shown on the ZWO website.
Tried looking at the filter at different angles at different light source with complete confusion. Maybe they are really faulty. Tested all 3 filters on VEGA star and SII is great but Ha and OIII have a huge reflection issues.