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Good effort John
with globulars you need to run several groups of shots of varying lengths so you can create depth in the image without burning out the core
Is your camera modified ?
Depending on the VB of the target I'd with a bright globular like Tuc I would run 10 shots of around 1 minute, 2 min and 6 min and if your tracking is good a few of 10 minutes to capture outer structure and dimmer stragglers
There are charts available that classify globulars based on their core structure as an aid to detemining what the core region should look like in a final image
Also globulars are generally full of a variety of different stars some however are predominant so understanding the make up of the glob aids in detemining what colours you should be looking to acheive in the final image
IMHO framing is also important IMO you shouldn't neglect including background with globulars as this gives a better persepctive.
Keep at it
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