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Hi Chris,
If you point them against the light through the filter wheel opening by manually rotating them you will notice following:
1. LRGB will be lighter to look through and will pass more light and will show the corresponding color
2. Once you have identified LRGB the rest is HA, SII, O3
3. Ha and S2 both will be reddish that will make identifying O3 easier.
4. In my eye S2 should look darker but that might depend on various things!
Hope it helps some way
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