Hi everyone,
Some pictures of these filters show the (maybe) same filter - one says Super-Duo-Narrowband D2 and another image from another vendors says Duo-Narrowband D2.
Is there a difference - one of the German vendors told me no, they are the same as long as it state D and not C....
D series are narrower than C, that is clear, but what is your opinion or experience regarding that little word "Super" in front of the entire name of the filter?
Thanks and CS
Georg
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Marketing? Are the bandpass plots the same?
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Tony Gondola:
Marketing? Are the bandpass plots the same? The bandpass plots look identical but for the "Super" it is often stated "halo-free".. I just do not know
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At one point, Askar also made a "super narrowband" G1 (HO) and G2 (SO) set. I believe they were spec'ed at 3nm. Maybe a vendor isn't providing an accurate description?
Edit: Don't worry about the G series. What it's all about are the specs on bandwidth. High Point and Agena show good specs, which are in the 6nm to 7nm range for each line on the D series. Ignore those marketing terms like 'super'.... super, relative to what???
I think Askar has eliminated the G series and only has C and D, with D being tighter bandwidth than C. So maybe they've migrated the 'super' descriptions from the G series to the D series.
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From personal experience, the D series is not halo free, but it seems to be luck of the draw. I'm pretty sure they are listed as not able to be returned for halos, at least on some sellers.
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Can't see any major difference between the two and my copy is in fact "halo-free", to a considerable degree. Below is a 1 minute integration with Alpha Orionis off center to test what glare do I get at f/4.  |
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No halo in my image, sorry, just a off-center flare (which undoubtedly can be also annoying). Here is the debayered and stretched but otherwise unprocessed image. I can't see any hint of an halo, just diffraction effects from the spider system in my newt, whose vanes are circular. And, yes, my filter is a recent copy, just over a year old.  |
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 andrea tasselli (andreatax)No halo in my image, sorry, just a off-center flare (which undoubtedly can be also annoying). Here is the debayered and stretched but otherwise unprocessed image. I can't see any hint of an halo, just diffraction effects from the spider system in my newt, whose vanes are circular. And, yes, my filter is a recent copy, just over a year old.
I'm referring to that blue ring (not the reflection flare) in your image, now that it's color it confirms what I thought, of course it might just be an artifact or from the circular spider also, but looks like the same blue issues I had two years ago. They are still pretty good filters, and one of the only manufacturers that make the Oiii/Sii version. They are great for doing SHO images with a OSC camera. I just bought an Antila 5nm Ha/Oiii to see how it does compared to my old NBZ that I sold a while back. The NBZ was completely halo free but a little wider than I wanted.
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Looks like Agenaastro also got rid of that non-returnable for halos statement, so maybe the improvements have made them much better. I am glad to see the true bandpass information, they used to just advertise them as 6nm, which they were clearly wider than that. The real specs are now listed in the description so that's great.
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I'm referring to that blue ring (not the reflection flare) in your image, now that it's color it confirms what I thought, of course it might just be an artifact or from the circular spider also, but looks like the same blue issues I had two years ago *Nope, that's how diffraction plays with colors and a circular strut. A halo is an image of the exit pupil of the system superimposed to the primary star's image.
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