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Originally Posted by Gama
I dont think there worth the time or effort if living in a suburban area.
I have Meades 2" series 4000 nebula filter and another Japaneese one i purchased about 20 years ago, and used them on my 10" LX200 the 14" RCX and my 22" Newtonian, with only the smallest amount of difference.
Hence not worth the time, but for a dark site i cant comment, as i have never been to one dark enough.
Plus they are useless for imaging with, at least from my experience.
Spend the money on a really good 2" eyepiece around 15mm to 20mm.
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Gama,
Owning several top quality filters, including an Astronomiks OIII and UHC and a DGM Optics NPB I just can't come to the same conclusions as you on this topic. These filters offer a tremendous improvement in both small aperture and large aperture scopes "on the right target".
I will add that I usually observe from at worst rural skies and at best very dark skies. However, on the rare occasions I observe DSO's from suburbia, they still show significant improvement on the right target.
CS-John B