Quote:
Originally Posted by clive milne
One further point that probably deserves mention wrt extragalactic emission line sources; There will be approximately 1nm of bandwidth shift per 21Mly for Ha & 27Mly for Oiii
You can see that 3nm filters are pretty much out of band for objects as close as Virgo cluster members.
2c
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Well...there you go, never thought of that
so collecting a Ha data set to highlight the HII regions in galaxies outside our local group, using a 3nm Ha filter, will show nothing..?