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Hi Chris
Good choice on the dob, the GSO/Bintel dobs are great value, I have the 12" one.
With filters I use a UHC and and OIII filter. I only have moderate light pollution here so cannot comment on how effective they are against LP.
The OIII is mainly used for planetary nebula, mainly confirming the blob I think I see is actually there.
Both can also be used on the brighter nebs to really improve the view. M17 (swan Neb) M8 (Lagoon) and M20 (Triffid) all looked heaps better when viewed with both these filters the other night.
I tend not to hunt the fainter nebs so cannot comment on how they help with these.
Malcolm
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