I suppose it all depends of what you want to achieve and how much yu are willing to work: up to 20 sec it worked fine with just a tripod and 50 mm lens at the lowest f stop you can go. I see that many have been taking single shoots, which worked fine. Obviously the super detailed ones are the result of tracking for longer exposures.
You can experiment with different ISOs and shutter speed, the main point is that you do it early, as soon as the predawn lights come, the comet fades very quickly.
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