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Hi all..
I have used an Astronomik 1.25" UHC-E filter and find it excellent on Emission Nebula..(M42) even in Light-polluted area's...and..some of the other deep sky objects are tinted green probably due to the effects of the mercury vapour street lamps!!..but I have learned to allow your eyes to adjust to the object..try covering your head and scope with some dark material to stop any stray light..
Cheers!!
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