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M83
Can't believe you managed that result with 10 second subs. I have always been puzzled by how short exposures producing a low signal response can accumulate as much detail with heaps of subs as someone shooting 5 min subs with far less of them.
With accurate polar alignment being a key issue in obtaining quality images with round stars, why would you not shoot more shorter subs to reduce alignment errors and thus still obtain a great quality image such as you've done here.
What is the advantage of shooting longer subs? Saving space on your memory card perhaps! If there is no advantage then do your 10 sec X 97 subs equal 4 min X 4 subs?
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