Well, I have a small 1.25" Lumicon UHC filter, but it vignettes in my 24mm ep. So I want to buy another one of 2". I take an OIII or H beta also as an alternative. Even higher contrast and a H-beta even should show the Horsehead and California nebula. After reading
this CN article discouraged me from H beta and I prefer a UHC again. I'll use it with:
40cm Dobson at home, moderately light polluted and 10cm Genesis or 15x70 binos on a dark location.
What would you recommend?