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To be honest. In my 12 inch dob. Splitting Sirius at them moment isn't that hard. I split it two weeks ago at about 114x magnification. Sirius was close to Zenith though. So less atmosphere to look through. Every time I take my telescope out and Sirius is in the sky I try and split it, so maybe its easier for me since I know what size object I'm looking for. Mind you on the same night I was able to spot stars E and F at 114x magnification in the trapezium in M42.
The worst however is when Sirius B is hiding in a diffraction spike. Its completely invisible when it is.
Good eyepieces and optics is what you really want.
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