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Nicely framed and captured
Well done !!
The Baader UHC-S is actually a Visual filter ( not an imaging filter )
I use an Astronomik UHC visual filter for my 12” Goto dob to view emission nebula which works quite well ( although it does produce a greenish hue or cast in your eye piece view.
For emission nebula your better to use a dualband imaging filter to capture Ha and Oiii signal which will produce excellent results ( even under light polluted skies and moon glare )
Some good dualband filters are L Extreme , L Ultimate , Antlia ALP T
I’m sure the 2” will fit your Canon EOS Ra
Alternatively if you want to image emission nebula in Broadband ( during new moon period or the dark ) then just use a luminance filter ( the EOS Ra may already have a UV/IR cut protective window or Lum filter ?? If your skies are City / Suburban Bortle 6 + and higher light pollution, I’d recommend go Narrowband for emission nebula , Broadband is really tough in LP skies with emission nebula.
Clear Skies
Martin
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