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cameron12x
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p.2 #1 · p.2 #1 · Pushing R5 Raw files


Alternatively, I do have access to a site with Bortle 4/5 skies.

Would you recommend the Neodymium Moon & Skyglow/IR cut filter, or one of the IDAS filters (NB1, NBZ, et al)?

I really don't want to spend a ton of money, as this is a small-time hobby (at least for now). Would I need one filter or the darker sky site, and a separate one for my city location?

Thanks for your help!



Jun 28, 2022 at 11:00 AM
Milan Hutera
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p.2 #2 · p.2 #2 · Pushing R5 Raw files


These are two different kinds of filters.

Baader Neodymium Moon & Skyglow or Optolong L-Pro let in very broad spectrum of light except selected bands of light - for example some of the green/yellow spectrum that naturally occurs even on dark sites. These are all around fantastic filters for Galaxies, Star Clusters and even Nebulae.

On the other hand, IDAS NBZ is a dual bandpass filter which ONLY lets in specific wavelenghts of light - most likely Hydrogen alpha (656nm) and Oxygen III (approx. 500nm) and BLOCKS everything else (sort of). These are pretty much useless on galaxies (unless you want to capture the nebulosity in thoses galaxies and combine them with broadband data to get the nebulae a boost), reflection nebulae or star clusters such as Pleiades. They are FANTASTIC for nebulae which contains the specified gasses and block much of light pollution and Moon light. If you shot a Monochrome camera with a dedicated Hydrogen alpha filter, you can get useful data even uder a full Moon.

Be warned though, that filters with tight bandpasses (I'm guessing IDAS NBZ has a 7nanometer bandpasses) pretty much require modified filterarray in front of the sensor, guiding and a cooled camera, since you can easily go 5 or more minutes even under light polluted sky.

There is a misconception that you don't need a narrowband filter under dark skies, which is totally false. There is a massive difference in rendition of Messier 1 in broadband and narrowband. I can post samples later from our darkish sky.

So if you don't want to throw a lot of money into this black hole, buy a Baader Neodymium Moon & Skyglow, which is quite cheap and works nicely even with stock cameras (it did work nicely on my ancient 40D...).



Jun 28, 2022 at 11:35 AM
cameron12x
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p.2 #3 · p.2 #3 · Pushing R5 Raw files


Good information -- thanks!

I would screw-type 52mm drop-in filters that I use my Canon 200mm and 400mm lenses.

Couldn't find that configuration for the filter you recommended.



Jun 28, 2022 at 04:56 PM
Milan Hutera
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p.2 #4 · p.2 #4 · Pushing R5 Raw files


cameron12x wrote:
Good information -- thanks!

I would screw-type 52mm drop-in filters that I use my Canon 200mm and 400mm lenses.

Couldn't find that configuration for the filter you recommended.


Unfortunately astro filter standards are different. There is either 1.25", 2" or several unmounted sizes, like 50x50mm. If you want to use the drop in filter holder, you will have to find some sort of a work around - like using a step down ring, which will definitely introduce some vignetting if you are using FF camera. It will most likely calibrate out using flats or just simply crop out the dark part, since it will likely contain nothing important in the very corners of the frame.



Jun 28, 2022 at 05:16 PM
 


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Milan Hutera
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p.2 #5 · p.2 #5 · Pushing R5 Raw files


Here is the promised Messier 1 and some other examples. All three are work-in-progress.

Left - Broadband data with Baader Neodymium Moon & Skyglow.
Right - Narrowband data with Optolong L-Extreme - 7nm dualband filter - Hydrogen Alpha + Oxygen III.

Same scope, same camera - QHY 168C.







There is another downside of using Narrowband filters besides not being useful on galaxies - unnatural star colors. This is not very apparent on this particular target, but most of the time, the stars are almost completely white without any colors since only a specific red color and a specific green/blue color is let through the filter.

And here is a quick and dirty processing of The Trifid Nebula using Baader Neodymium Moon & Skyglow filter. When I looked towards the target I couldn't see any stars there, only thick atmosphere and light pollution. So low on the horizon. About 90 minutes of integration so far.







Last example - Trifid's even lower neighbor - the massive Lagoon Nebula using Optolong L-Extreme. It's so low on our horizon I wasn't able to achieve sharp focus. Well, it's in focus, just not very sharp thanks to the thick and dirty atmosphere. Quite a tight crop focusing on the heart of the nebula. About two hours of integration so far.










Jun 29, 2022 at 05:29 AM
cameron12x
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p.2 #6 · p.2 #6 · Pushing R5 Raw files


Very, very nice... Thanks for sharing. I HATE light pollution!


Jun 29, 2022 at 05:24 PM
cameron12x
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p.2 #7 · p.2 #7 · Pushing R5 Raw files


There are some tracking errors and colors are off.

I worked through a lot of issues last night (not the least of which was light pollution from my Bortle 7/8 location), but this is at least some progress imaging M51. Almost exactly an hour of integration time.

Heading to my Bortle 4/5 location tonight. Seeing and imaging should be much improved!







Jun 29, 2022 at 05:26 PM
Milan Hutera
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p.2 #8 · p.2 #8 · Pushing R5 Raw files


Which software are you using for processing the data? You seem to be crushing blacks/shadows, which is a mistake that a lot of beginners make. Deep space is never completely black, so you should be leaving a bit of brightness there. How much? Hard to tell, you will get there as you shoot more and process more. I myself am guilty of overstretching the blacks/shadows and saved outputs look way too bright.






Jun 30, 2022 at 06:44 AM
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