Excellent nebula filter. Highly recommended

I purchased this filter along with a RASA 8 purposely to use with that OTA and an ASI-294MC Pro, OSC 4/3rd's camera combination. I haven't used it with other optics yet. However I have found that the effect the filter gives to the 294's sensor is (to me) quite stunning. Not the same as using a mono camera and dedicated NB filters but striking none the less. Having the ability to capture widely spaced narrow bands of the spectrum in single exposures opens the possibility to either process images as-is or split the colour channels and process each channel separately before recombining. There are other multi NB filters available but this was the only one that had the quoted ability to be used with fast optics.
I've given it 5 stars because I've been stunned by it's effect when coupled to the fast RASA optics and an OSC camera. It will definitely be tried on other optics - once I can get the RASA off the mount.