I really can't recommend them right now. Mine (a 2" version) seems to be good at casting a greenish-gold tone over the FOV, and that's about it. I've used it under great seeing conditions, and under not-so-great conditions, and the image was ALWAYS better with no filter at all. (I'm referring to Saturn and Jupiter here). I used it on an optically excellent, collimated 12" LX200, and a 120mm Astro-Physics refractor. In both cases the unfiltered views was definitely better.