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Hi Allan,
Here are a couple of observing notes from over the years using 25cm and 46cm aperture:
Ruprecht 106 GC Centaurus
25cm x86: Not a particularly difficult object. Found in a field of nearly innumerable stars, 2 degrees S of Gamma Centauri. Appears as an unresolved fairly sizable milky glow perhaps 2.5' diameter. Seems to have several faint, apparently superimposition stars about magnitude 14. magnitude8.5 star to the S by 4'. The field is littered with scattered magnitude 13-14 stars like the sands of the beach.
46cm x185: This cluster is quite close to a magnitude 9 star, 3' away to the S as a quite diffuse, hazy, galaxy-like looking object perhaps 2.0 -2.5' diameter with several faint stars scattered over the top. These may be resolved stars but are just as likely field stars at about magnitude 14. Appears to brighten broadly and slightly to centre without core or pip, 3' diameter hazy, background does not seem granular. Profusely littered field.
Best,
L.
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