Welcome Remus , and very nice image. I also image in hydrogen alpha but using a modofied Canon 350D DSLR, using either a friend's 300mm f2.8 lens, a 6 inch f3.6 schmidt newtonian, or a 10 inch f5.6 newtonian. I also use a Baader UHC-S Nebula filter for colour work or a baader 7Nm Ha filter for the Ha imaging.
Scott
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