Astrophotography in Exotic Nii Emission Line (ft. 3nm Nii filter from Chroma)
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- Опубликовано: 8 сен 2024
- Hello? my name is Darwin, and I'm an amateur astronomer living in heavily light polluted city of Seoul.
In this video, I'll be explaining what the [NII] emission line is, the Nii narrowband filters, and what you can actually get by using one.
I will be showing you my latest works imaged with filters only in the red spectrum (Sii, Nii and Ha).
I've been using my Chroma's 3nm Nii filter for over 3 years now, so feel free to leave any comments or questions that you might have.
This is the link to Paulyman Astro's video about Foraxx Combination, so check it out if you want to know more about this technique!
• The Forax Narrowband P...
This is a video on astrophotography.
I plan to upload videos on some more advanced astrophotography topics and my AP works, along with tutorial videos for the beginners.
Feel free to suggest any topics or questions you always had.
I'll look at them make a video about them!
Happy New Year!!
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Great video. No need for the subtitles your english is fantastic
Many thanks for your kind comment!
I had to go through many hours revising the script and recording due to my bad English :)
@@StarsAboveRooftop ty for the effort :)
I was quite interested until you mentioned it’s only 3 nm away from HA. I think Long before I would spend over $1000 on an Nii filter I would swap a 3nm HA for a 5nm which is actually cheaper. Either way good information it’s always cool to learn something completely new. Appreciate your content. Thank you 🙏🏼
Due to Nii filters being so expensive, I guess you've got a fair point.
Many people I know (here in Korea) use 5nm Ha filters intentionally to capture both Ha and Nii eventhough they use 3nm Oiii and Sii filters.
But it's always fun to play around with other emisison results and create your own unique pictures!
Thank you for watching!
If you’re using narrowband filters and one of them is 5nm wouldn’t that bottleneck the image to have it light polluted to the widest narrowband filter? Making the 3nm worthless… even more than worthless… you’d be doing yourself a disfavor by reducing the signal you get in the 3nm filters (and paying more)
Just curious
@@derekderek2570 Well, in terms of light pollution, yes, 5nm will let in more light pollution, reducing the potential for cleaner Ha signals.
However, when you are imaging objects with strong Nii signals like the planetary nebula, the 3nm Ha filters will cut off some of the details that you might have captured from a combined Nii + Ha signals of the 5nm Ha filter. Or at least that is what the makers of Nii filters say in their advertisements. Get separate signals with 3nm Nii and Ha filter, or get 5 nm Ha filter and get both Nii and Ha.
If you want that extra little detail in your images at the cost of light pollution, I think it's worth a try.
@@derekderek2570 baader and other companies literally sell SHO sets that are different size band passes depending on the gas. I think one set has 2 that 3nm and a 4.5 or 5nm. They aren’t the only company that does that so seeing as some manufacturers already designed their filter set that way, I don’t think it would make a big deal
Absolutely incredible images! Very in-depth and technical video, thanks for posting.
Thank you for watching the video!
There's not a lot of Nii filter users out there, so I wanted to share with fellow astronomers what you can do with this filter
Interesting thanks. I deliberately purchased the Chroma 5nm Ha filter so I could capture the Nii on the edges.
I believe it was a fine move! Unless you are really struggling to capture details in Ha (which I think isn't very difficult to do even under heavy light pollution), 5nm filter will give you the details in both Ha and Nii combined. Some people say that some of the details in 'Ha region' can be lost due to lack of Nii singals if the bandwidth is too narrow.
I have no experience with 5nm Ha filter, so I cannot compare 3nm vs. 5nm, but I can assure you that the Nii images are somewhat different from the 3nm Ha images.
@@StarsAboveRooftop I am now researching the purchase of an IR Pass filter to try and improve the capturing of reflection nebula.
Great video and interesting. Keep up the good work. Subscribed. Clear skies
Thank you for the compliments and for the subscription!
I'll try my best to make informative videos like this! Clear skies!
best video on this topic I have ever seen
Wow, thank you for such high praise!
Nobody really uses Nii filters, so I think I'm quite unique in this respect. Hope my video gave you a good idea on what this mysterious Nii line is!
@@StarsAboveRooftop I ment astrophotography in general, you provided very detailed information and showed us spectacular images
@@janomacko5764 Thanks Jano with your kind words! Glad I could be of any help with my pictures and infos!
Really enjoyed your video - something fresh to learn - keep up the good work!!
Thank you for watching and for the encouragement! It feels really nice to get a nice comment from a well known astro youtuber!
Video was very interesting and educational. Enjoyed it. Thanks
Thank you for watching! I'm glad you found my video interesting and informative!
very nice results and thanks for taking the time to explain everything so thoroughly! I'm looking into NIR-emission lines as they suffer less from Rayleigh scattering (start imaging before complete dark! 😮) ànd atmospheric abberation (less need to be on a mountaintop).
Great work!
Thank you Travis! Feels great to get such encouragements!
hello from hk. Excellent video ❤
Welcome to the channel! Thank you for watching and for your encouraging words!
The Nights of Nii!
Thank you for watching! Nii! Nii! Nii!
Thanks for the great informative video! subscribed! BTW you don't really need english subtitles your english is perfectly understandable. But you do you my friend :)
Glad you found it useful and thank you very much for all the good things you said! (And for the sub too!)
It's really encouraging to hear that my English sounds okay to many people :) Expected more of a "what the hack is he saying" sort of situation.
Still, I'll put english subtitles in case I mispronounce or say something in weird accents
Hi, greetings from Bortle 8.5 London, I really enjoyed your video, a great mixture of tech and examples, well presented and not too long. I've subscribed and look forward to more. Like others I'm also keep to pick up a 48mm 3nm Nii filter to go with my SHO set. Now I'm just wondering which of the LRGB will have to go. Perhaps if they make them for F2 then I can buy one for my HyperStar.
Thank you John for watching the video and for the sub!
I mostly image emission nebulas, so replacing L with Nii seems to be most sensible to me. (RGB for stars only)
In my case, I use two carousels, one with only the broadband (LRGB IR UV) and the other with narrowband filters + L.
Platesolving with narrowband filters under heavy light pollution fails very often :(, so I always keep L filter in the narrowband filter carousel.
Your content is underrated bro
Just sub
Great video. Mind sharing a link or description for the tent you are using at the end of the video? I need one for my windy rooftop.
Thank you for watching all the way till the end!
Ah, about the tent... I'll make a video about it someday soon.
I bought it in an online shop in Korea, which I don't think non-Korean speakers can buy from that easily...
It literally translates into ice fishing tent, that I just flipped upside-down, so I have open ceiling and covered ground.
I think there are similar tents on places like Aliexpress, so you may have to look around a bit.
@@StarsAboveRooftop thank you! Plenty of ice fishing tents available on Amazon here in the states. Id been looking up stuff like “roofless tent” but didn’t think to just flip it upside down. Appreciate the tip!
Interesting. I never considered a Nii filter but it would be helpful on those targets that lack Oiii. Subbed :)
Thank you for watching!
Yes, it really helps on targets with low Oiii signals. It's unfortunate that nobody really cares about Nii in reality, though.
I don’t think it’s no one cares the cost to value ratio might be the worst of any product in the history of man. It would be like having a sports car and spending $1000 on a carbon fiber steering wheel to save weight. That money could buy a turbo or all new tires. Something that has actual value. Nonetheless, I enjoyed your video!
Hi, which square shape tent you are using for shielding your imaging setup ? looks nice design please give it's product link.
I'd like to know about the folding/portable observatory/tent you used toward the end of your video. Who makes it, where did you get, etc? Thanks
Thank you for watching!
It's not really a dedicated tent. It's called Ice Fishing Tent and you can find them easy on Amazon or Aliexpress, etc. Many Korean astromers use them for wind prevention.
You can either cut off the top of the tent, leaving only the walls.
Instead of doing that I'm one of the few who flip the tent upside down, leaving the open bottom face the sky.
I'll be doing a review of sort about this tent, providing my experiences and guiding results, etc!
Interesting. So do all nebulas have nitrogen emissions? I barely get oxy3 here in bortel 9, should I use nitrogen instead?
do you have a script for subtraction on the 10% and 30 % overlap on the ha-nii filters ? bummer about astrodon, i got my filters from chroma.chroma still do custom orders, thinking about getting a hii filter for pn
I was thinking having watched your vid, whether using a 7nm Ha filter - 3nm Ha filter (and calling the difference as a synthetic N2) may yield a similar result? - call it the poor man's N2, as I don't have the $$ for an N2 filter.
Thank you for watching!
I think your method would work on planetary nebulas and supernova remants, where Nii and Ha signals differ quite a bit.
On other emission nebulas, the differences are very subtle. 3nm filter will also captures Nii, so you might have difficult time extracting enough Nii out of your data.
I haven't done it, so I'm not 100% sure.
What about Helium, Neon and other exotic bands ?
Thank you for watching!
I do have two other exotic narrowband filters that encompass He ii and Ne iii emission lines, which I bought from Edmund Optics.
I did some tests with bright nebulas but haven't used them enough to draw any conclusions or suggestions.
All I can say is the images produced by these filters are somewhat different, but their signals are really weak.
What do you think about H-beta?
I appreciate your content, however, when Darkrangerinc talks, I listen.
I can't find this filter in chroma website can you give me a link? thanks and clear skies.
Thanks for watching!
There's no link to it. You have to contact Chroma and ask for it in person via email. That's one of the reasons why I emailed both Astrodon and Chroma in the first place.
@@StarsAboveRooftop thanks, and what filter wheel do you use an 8 position one (LRGB,Ha,Hii,Sii,Oii)? also do you use other "exotic" filters.
@@rehon101 Oh, I use 7 position filter wheel.
I have other exotic emission line filters (He and Ne; they are meant for planetary nebulas, but I rarely use them though..), ultraviolet and infrared filter, so I have two carousels, one with narrowband (L, Ne, He, N, S, H, O) and the other with broad band filters (L, R, G, B, IR, UV). I switch the carousel out if I were to change from boradband target to narrowband target or vice versa.
@@StarsAboveRooftop thanks
@@StarsAboveRooftop He is He(II) but what is Ne and Id watch videos about them
Are you on Astrobin?
Nope, unfortunately I have no astrobin account.
I almost exclusively enjoyed and shared my astro work in a Korean astro community.
Since, I now have a RUclips channel, I think I should seriously consider making one to share high resolution images...