G'day Matthieu..
I wish you luck in your quest to observe the Veil Nebula. I've tried for it a few times from my backyard at 32°S . It does culminate rather low for us, I used my 10 inch dob but couldn't see it, too much light pollution. I don't own any filters yet.
I reckon a dark site with a OIII filter and 16 inches of aperture should do the trick. Good luck!
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