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Hi eardrum, check with asimov on this one.
Off the top of my newbie head, i can think of 4 nebula which i can see in my 10" dob without filters. I have little light pollution and so i am very happy with the nebula viewing.
lagoon in the milky way, tarantula near the large magellenic cloud, keyhole below the southern cross and the brightest is orion.
If you can wait up until 1am and you have clear skys, Orion is rising in the east.
Look for the saucepan and look at its handle. I suggest you take that as a reference point. I you can see the greyish clouds and are happy with that then don't bother spending heaps. If however you want to track down harder to see nebulas, go for it!. To get the lovely coloured version, well that is where long exposure imaging comes in. The eye can't see, but the camera can!
A nebula filter for me is low in priority, barlows and a really good eyepiece are next due to mars getting so big!!!
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