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Great image, Michael!
I use my 383 with SGP like you and I find using bin 3x3 with 0.3s exposures, sub-framing, then zooming in on a single star a great way to get focus right. Here's an example from tonight 
Getting a motorised focuser helps too
Cheers!
Chris
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Thanks for the tips Chris
I had no idea that binning sped up the download process until Barry mentioned it.
It sure will take out allot of the frustration i have with focusing and centering image.
I do have an old motorized JMI focuser that has a shoestring USB connecter does make it much easier.
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However, it will be closer to the background than the mean figure of 15,050. I'd say your background is probably around 6000, but hunt around the image and check that out.
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Barry i took a better look at my Lums.
I found most background areas hovering around the 12k to 14k Mean in the fluorescing gas parts and around the 9k for the darkest areas.
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Do you image at a dark-sky location? I know Cessnock is in a rural area, so if you're away from the town a bit, then your sky background could be quite low, except in the direction of the Newcastle light dome.
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Actually pointing towards Newcastle has the darkest skies for me as i live close to a prison so the North and North west i don't even bother trying to image near there.