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I looked by info on them, to check if my observation was correct, it's very curious, the citation there is of about almost the same apparent dimensions for the two (36' M4 and 36,9' OC) I think this difference I observed should be related to apparent magnitude them (7,12 M4 and 3,7 Omega Centauri).
You have to be careful about the size of these objects posted on the Internet. The best sites will give a photographic apparent diameter and a visual apparent diameter. OC appears much bigger than M4 visually.
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Re: M4 in 15x70's