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Hydrogen Alpha filters for NV

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#26 GOLGO13

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Posted 11 October 2019 - 01:59 PM

Gavster,

 

Do you remember if they acted exactly the same as well? Again, my setup maybe a bit different which may explain things. My light pollution is less than yours in London. But, I still think it should have worked better than it is.



#27 slavicek

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Posted 11 October 2019 - 04:10 PM

Hah...yeah. ive already thrown the not getting more stuff out the window. However, I sold some items. I'm guessing a lot of people who get into night vision make some drastic changes with their equipment. I may try the 6nm astronomik...the chroma 5nm seems a bit too much money. I think I will also get a 12nm to have some options.

I am sorry to say that (because of the cost to you lol.gif ) but the 5nm Chroma is my #1 filter for NV - it performs best. I have 3.5nm and 7nm Baaders and they are very likely as good as chromas but the 5nm might just be the ideal wavelength for my set up.



#28 GOLGO13

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Posted 11 October 2019 - 04:51 PM

I can imagine it's a good filter. The 8nm Chroma is really good so far. Though if the astrodon and the chroma are close in usage it appears my unit doesn't like them. I think it will be telling how the Astronomik 6nm performs.



#29 Gavster

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Posted 11 October 2019 - 05:25 PM

Gavster,

 

Do you remember if they acted exactly the same as well? Again, my setup maybe a bit different which may explain things. My light pollution is less than yours in London. But, I still think it should have worked better than it is.

The views were very similar - maybe the chroma was slightly better but it was so close as to be virtually the same. 


Edited by Gavster, 11 October 2019 - 10:09 PM.


#30 GOLGO13

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Posted 15 October 2019 - 07:52 PM

In-between testing the new 12nm and 6nm astronomik against my Chroma 8nm

 

All I can say so far is it's very subtle between all of them. And surprisingly I'm not sure I can make a decision on which one I like the most. I do believe the 8nm and 6nm are slightly better on detail. But between the two it's very close. Big difference was seen with the 5nm Astrodon I had and the Chroma 8nm...so maybe that filter was just a bit weird or passed a threshold?

 

Anyways. I'm going to do some more checking. I'm not saying the views were exactly the same...but it was very close.

 

I observed the Lagoon, Trifed, Swan, and Eagle. I'd say the eagle was the one that had the most difference in view, though subtle. I used the 6 inch F4 in three modes. F4, F2.8, and barlowed 2x.

 

Moving to the back deck and will look at the Cygnus region. And by the way, that's a lot of screwing stuff on and off! haha.

 

One big difference I observed was the mechanical parts of the filters. The Astronomiks are thin and are much better at screwing on and off. The Chroma didn't seem as nice in this category. 



#31 Mazerski

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Posted 15 October 2019 - 07:58 PM

GO

 

Have you been able to try a filter wheel on scope? 
Several NV users have success — I use a 5 filter wheel (1.25” filters) and it has to rank as one of the best gadgets to use. 

 

 



#32 GOLGO13

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Posted 15 October 2019 - 08:13 PM

So I looked at the North American Nebula at F4, and in my opinion the Chroma was slightly the best. But the Astronomik 6nm was very close. The 12 was a bit dimmer, but not bad.

 

Also looked at the butterfly looking one (sorry, don't know that one by name). Again subtle but I think I prefer the Chroma.

 

So good stuff as in all of the filters are working well. 

 

I'd like to do some 1x comparisons as I suspect there could be some differences there.



#33 GOLGO13

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Posted 15 October 2019 - 08:15 PM

GO

 

Have you been able to try a filter wheel on scope? 
Several NV users have success — I use a 5 filter wheel (1.25” filters) and it has to rank as one of the best gadgets to use. 

I do want to try one. I will say I'll have to measure because the Chroma filter is very tall in comparison. But hopefully it does fit. Or I need to choose a filter wheel that would match it.

 

Do they have 2 inch bottoms on them where I could use the .7 reducer? I wouldn't really want to lose that capability.



#34 Mazerski

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Posted 16 October 2019 - 12:31 AM

I can't help with filter thickness - maybe one of the others figured it out.

 

Standard 5 filter 1.25" Wheel - I have Gosky and Astromania brand:

 

First 2 photos show how it fits (used in SCT: f/10 8" Meade ACF) -- 0.7x FR and Blue Fireball adapter - its about 7mm or so thick

 

3rd & 4th photo: I have the BS8ED astrograph and scope comes with its own corrector / reducer and for the Mod 3 to focus I needed this very thin 3.5mm adapter from Astromania.

 

 

PVS7 never has focus issues and Mod3 almost always has focus issues.

Attached Thumbnails

  • FW1.JPG
  • FW2.JPG
  • FW3.JPG
  • FW4.JPG


#35 GOLGO13

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Posted 16 October 2019 - 03:12 PM

Thanks  Mazerski....Never knew of that site and it was extremely affordable. I picked up the above...so we'll see how that goes.



#36 GOLGO13

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Posted 18 October 2019 - 08:00 PM

Tonight was a little better night without the moonlight. 

 

My opinion is the 6 or the 8nm would be fine if it were my only filter. I'd give a slight nod to the 6nm in the 6 inch F4. However, at 1x I prefer the 8nm because it doesn't get as weird with a cutoff and it's similar for the view. But the 6nm does fine also.

 

I could tell the 6 and the 8 gave better detail on objects slightly over the 12nm. So I'd say it's worth going a bit past the 12nm for a light polluted situation. But I felt both the 6nm and the 8nm were very close in capability. 




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