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Yes. I have an Astronomik UHC-E clipin, but it is also available as a normal 48mm filter.
UHC-E is very good. I use this filter even in Bortle 6 skies but can make pictures of faint red Halpha nebulas like IC1396 or IC1805 (Heart Nebula) with my unmodded 6D.
And I also used this filter once on the LMC and it shows lots of Halpha nebulas in the LMC.
Attached: NGC 7000 and IC1805 under Bortle 6 home skies, Vela supernova remnant (under better skies from Parkes NSW).
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