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mmm. Trevor - this is what I'm seeing with some of the shots showing up on CN. It could just be that you need the focal reducer/flattener to cure what might be field curvature. Given the shot you've posted of Omega Centauri, and what I've seen on CN, and what the far more knowledgeable people on there have come to conclusion wise, I suspect movement at the camera end and less than perfect collimation.
This is using the GSO focuser, whereas the shots on CN are from the Astro Tech unit, which I believe uses a featherlight focuser (obviously higher quality).
The 2nd shot looks better, but there is still weird star shaping away from the central section of the image. I'm hoping it just needs the flattener.
Dave
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