You probably have enough info by now but I have had the Radian triad filter for several years. Very expensive and no longer available I think because of the cost. I think it has produced great results in my bortle 8 city skies.
I thought that filter was out of date so purchased the Antila Dualband Ha and Oiii 5nm a couple months ago.
After using it, it is back in the box if you want to buy it.
It was not cheap but the results with a 135 f2.8 and a williams 71 at f4.7 were not in the same ballpark as my Radian filter.
I would look for a used one of those.
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Dan Kearl:
You probably have enough info by now but I have had the Radian triad filter for several years. Very expensive and no longer available I think because of the cost. I think it has produced great results in my bortle 8 city skies.
I thought that filter was out of date so purchased the Antila Dualband Ha and Oiii 5nm a couple months ago.
After using it, it is back in the box if you want to buy it.
It was not cheap but the results with a 135 f2.8 and a williams 71 at f4.7 were not in the same ballpark as my Radian filter.
I would look for a used one of those. Hold on to that filter it looks like a unicorn. Cheapest I found used was a thousand USD,
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Hi Clayton, Another Bortle 8 dweller with an OSC camera here. I use L'ultimate filter and have been quite happy with it. You can see my profile - most of them are from Bortle 8 areas using L'Ultimate. I have been quite happy with it. When I was researching filters, I had stumbled upon James Thompson's posts on cloudynights. @Rick Veregin has posted one article from his researchgate page; I would suggest seeing other posts too, where he has specifically compared some of the filters that are being discussed here. https://www.researchgate.net/profile/James-Thompson-32https://www.researchgate.net/publication/364965907_L-uLtimate_Filter_Comparison_Testhttps://www.researchgate.net/publication/377356680_Testing_the_Ultra-Narrowband_FiltersHope this helps. Clear skies Rajat
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is there a best spot to place nb filters when using reducer/correctors to lessen halos?…closer to the camera ,or closer to the telescope?
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It doesn't really matter but the further away you are the wider are the halos.
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Thanks all, this post as convinced me to upgrade my l-eXtreme to the l-Ultimate as I shoot with a RedCat51 / ASI294MC in B9 and the halos are very noticeable. I don't mind them so much, but they do make things look a bit funky.
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