So I am considering another purchase for nebula imaging. I currently use an ASI1600MM-C, Astrodon 3nm filters, and a 350mm f4 lens or an f7 reduced EdgeHD 800 scope. I am in Tokyo, so a super white zone, it's terrible.
I have a 294MC Pro sitting around pretty much unused, so I am thinking I could put it to good use, after I saw the Triad Ultra from OPT being release. The problem with the filter is that it only works for f4 or above without too much bandpass shifting.
So I've been wondering whether a broader pass band filter like this one http://sightron.info/quad-bp-filter/ could work with the RASA 8 - in which case I could use that as a light bucket, which I could use in parallel to my main setup to capture OSC images... Or would other filters work well? Such as the Idas NB1? That one seems to kind of ignore SII....
Also, what is needed in addition to the RASA 8 to add a 48mm filter in the light path?