Matty's very correct Barry. Lots of short exposures does the trick. There's also HDR. I took 10x5 sec frames, 10x10 sec, 10x20sec and 10x60sec frames as well as 2x120sec and 2x360sec frames all merged in Photoshop HDR to from the final image. It's resolved right to the core and there is still a reasonable amount of nebulous area showing. The longer frames all had the core badly burned out, but the HDR ptocess understood this and the result is pretty reasonable.
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