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Thanks everyone, I did not know there was another thread in visuals otherwise I would have put it there.
I did have a go at it visually in 2011 and used 320x mag and it popped in and out of the diff spike of my newtonian worst luck, the blue filter kept it out more permanently on 2 successive nights. My scope position has now changed rotating diff spikes conveniently by 45 degrees.
I used the same fl as I used for Jupiter so it was pretty long. Sirius B is about 110 pixels out from A, I would advise 0.20"/pixel to get it nicely separated out.
Regards, John.
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