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Double cluster - how to improve

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Using the advice from SGL I've made some improvements to my M42 shots. I thought I'd move to a different target for a while and try and apply the same tips you've been giving me to that!

Here is my first(ish) double cluster, it's 27x30s exposures. I've used ImageJ to remove the background and enhance the contrast. My first thought for improvement is better alignment so I can get longer than 30s exposures and get less elongated stars. Anything else you guys can suggest to improve it?


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