[BC]

I tried taking 10 x 30sec shots of Omega Centauri last night, 10 darks and 10 bias and put them all together in DSS. While the background noise cleared up nicely, the basic globular blew out badly with no detail. I reduced the size of the stack until, really the best central detail is with a single 30sec shot. How do I stack without losing the central detail? I have attached both the single shot and a stacked one. This stacked one is just 2 lights, 2 darks and 2 bias.

Canon 500D
Equinox ED 80
ISO 1600
30sec

Thanks,
Bruce