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The Crab is a difficult object at the best of times. It is very faint, and even in my big dob, 17.5", it is difficult and unimpressive. Technically, it is not a Planetary Nebula, but a supernova remenant.
Try this Planetary, near the southern Cross: NGC 3918
It lies just to the right (west) of the Southern Cross, within Centaurus, and most star charts will show it too, easy to find too.
The first time I saw it I was taken aback at how bright AND how blue in colour it is.
It will be a stunning object in your 6".
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