![]() Thousand Oaks is good too but transmission is a little lower at least on the sample I have so I think it is better on a larger aperture telescope (background is jet black though in 10.1” giving very high contrast!). I also recommend the Lumicon O-III but you cannot go wrong with Astronomik or Tele Vue. The O-III is best all round line filter for most nebulae. The UHC is a good choice as it passes O-III and H-Beta but given your sky pollution I recommend the O-III for greater contrast. The optical performance of your telescope is not reduced by the filter in any way.You will see a significant contrast boost especially with a narrower bandpass line filter such as an O-III under polluted skies.
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