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filter comparison for a mod. insensitive Canon 77d (DSLR); Helix nebula = NGC 7293; bortle 8-9 and 52° N; IDAS V4 Optolong l-pro, Optolong l_enhance;


filter comparison for a mod. insensitive Canon 77d (DSLR); Helix nebula = NGC 7293; bortle 8-9 and 52° N; IDAS V4  Optolong l-pro, Optolong l_enhance;





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