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"every one to use same thread..."??
That is what a thread is all about ...8)
As too the images, any set of same exposure would be good, not trying to set a definite standard, but if a longer exposure and processing show tail structure that's cool too. As this comet is going to be in a good position there may opportunity to make longer sequences that came show dynamic tail movements across say 4hrs..??
I got this comet rising above the garage in the SE sky last night...pics soon.
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