Advice Needed - To jump or not?

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Mossyback avatar
I've been doing astrophotography for a number of years. I started with OSC and then switched of Mono. I'm under Bortle 4 skies using a 120mm refractor.

I doubt that I'll ever be good at processing but I seem to get reasonably good data. I've been looking at images produced by people who use S/H/O filters and marvelling at the incredible colours. 

So, what are the pros and cons of venturing into this area of "frustration"? I know that I need more filters but what other things should I be considering? e.g. do I need all three filters, do exposure times increase with them, is the moon a limiting factor, do I use them along with my RGB filters … ?

Hank
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John Hayes avatar
Here's my view from 30,000 feet.  If you find learning something new to be interesting and fun then take on narrowband imaging.  NB imaging allows taking high quality data when the moon is blasting stray light all over the sky and as you've noticed, you can produce some spectacular images with NB data.  On the other hand, if you find that learning something new is "frustrating", don't do it.  Hobbies are supposed to be fun.

John
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Mossyback avatar
Hi John,

I agree with you completely. Learning new things needs to be enjoyed. I'm satisfied with my equipment and most of the time it works as it should.  Most of my frustration in this hobby is with the weather as I literary wait weeks for an opportunity to indulge. Pixinsight is always a challenge but help is always available on line. 

I appreciate your input.

Hank
Brian Puhl avatar
Generally speaking you can get away with just Hydrogen and Oxygen filters when you're starting out.  Sulfur data tends to mimic Hydrogen, but there are some differences.     With a good set of 3nm Filters you can image even under a full moon (not saying it's ideal however). Oxygen is the one element/filter that takes a hit when the moon is out.   Hydrogen you will hardly notice any difference, there will be more background, but the signal is still usually strong.    Using narrowband allows you to capture data on almost any clear night.  

Personally I find narrowband processing much easier than broadband image processing, so much that in my 6 or so months of imaging, my images are almost exclusively narrowband.  There's less gradients, less background extraction involved and overall a much cleaner, stronger signal to work with.   There are also tutorials for combining narrowband data with broadband data resulting in some amazing images.   My latest production is a unique process combining Ha with RGB.  Feel free to check it out.     

There's no question, you should definitely dive into narrowband.  Especially if your weather limits your imaging time.  Exposures will be longer, and if your camera can handle it, as long as you want really.    I typically do 20 minute exposures for all my narrowband stuff now.
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Mossyback avatar
Thanks,Brian for the encouragement to get into narrow band. 

At your suggestion I looked at your images. They are truly amazing. I noted that some of your exposure times were up to 1200”. At what point do you start using guiding?
Brian Puhl avatar
Thanks,Brian for the encouragement to get into narrow band. 

At your suggestion I looked at your images. They are truly amazing. I noted that some of your exposure times were up to 1200”. At what point do you start using guiding?



I'm always using guiding.   My EQ6s are not accurate enough to go without.     My guiding has always been consistent tho, so I rarely lose subs, and if I do, it's because of clouds which get thrown away anyways.   

Also, thanks! 🙂
Stjepan Prugovečki avatar
I had similar dilemma , and pulled the trigger for mono camera and 7 (LRGBSHO) filters. (SHO are Antlia 3nm) . Being in Bortle 4/5 , narrowband brings the whole new world , especially when the Moon is up. OIII is affected by moonlight, but it is still manageable. I am usually taking RGB images for stars (20-30 one minute subs  per RGB filter.)  You have to increase your exposure compared to RGB (On Esprit 120 with QHY 268 I usually take 4-5 min subs for SHO ) . I have to admit that I rarely use SII filter and could imagine the life without it , as one can simulate Hubble palette from Ha i OIII only. Of course it would be better with SII , but it is usually very week, so it takes long to collect.  
I do not regret the investment. The only con is that it gets quite costly (filter wheel and filters)
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Trevor Bray avatar
I got my first mono this January and started with SHO 3nm filters only.  I love it and have now been thinking of getting LRGB for the stars and shooting galaxies.  The processing has not been that different and still working on perfecting workflow.  I say go for it!
David Collis-Bird avatar
@trevor,If you havea askar refractor around 500mm f.l   your 183 zwo will give around 1.5-2.0 arc secs /pixel  camera has 2.4 micron pixel colour camera.this combo will yield the highest resolution.Most of the other cameras  6200full frame massive field for less resolutiuon.you can narrowband for colour cameras.since 2004 for me with digital prrior 30yrs film..
Hope this helps Best David
Marcelof avatar
Since you are lucky to be in a zone 4 I don't think you really notice the difference in how easy it is to do narrowband (for someone in zones 7 -8 the difference is huge).

But the real advantage you can take is that you can do AP even during a full moon* and get really fantastic images.


*This goes for Ha and Sii. Oiii never when the moon is present. And if you use a guiding camera it is a good idea to look for targets far away from the moon, because even if your main camera won't have any problems, the guiding camera can easily overexpose horribly and not pick up anything.
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James avatar
Personally I have also found NB images easier to process.  You have greater latitude when it comes to the colors and the details are great.
Mossyback avatar
Thanks for all of your input. I’m going to go ahead with narrowband imaging. I can’t resist the challenge.
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