Imaged this recently, taken with a 14" RCX with a f5 reducer.
Exposure was 20 x 10 Seconds (3.5 minutes) to avoid burning the core.
Camera QHY8, 6 Mpixel One shot color, slightly processed for sharpness before stacking in Maxim DL. Reduced size to 1080 705 to fit on screen.
For a full size go here
http://qhyccd.com/ccdbbs/index.php?a...c=161.0;id=249 .
Theo