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Thanks Rex and Michael.
I know that with no clouds and fogs iluminated by light pollution from Saquarema city - at this time, just after sunset, this e others planetary nebulas are just over that city - the photo would be better.
Despite it, I got some details of the main ring.
PN is very hard to shot because they are very small and faint. You need of good transparency and black sky.
And thatīs truth: with subs of one minute you will need a large number of photos to get a good amount of data. And with low drift between them.
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