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John
The 50 per inch is a "theoretical" maximum assuming very dark skies and perfect seeing. In reality is is closer to 10 or 20 per inch and in a small scope like yours, 50x would be usually adequate for reasonable views.
A 130mm scope at 50x will show quite a few DSOs nicely, EG M42, Omega Cent, NGC 2070 and should be able to pick up Cent A Galaxy with little problem.
Malcolm
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