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Using H-Alpha and OIII filters?

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#1 By-tor

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Posted 30 November 2020 - 08:21 AM

I use a OSC ASI533 camera and only own one filter a 12nm H-Alpha, but ordered a filter wheel so I don't have to keep shutting down and removing the filter to image something that doesn't require the H-Alpha and can be changed from the comfort of my house as it is all control through wifi now (I know lazy, but hey).

 

I have been thinking about purchasing an Optolong L-Enhance or L-Extreme filter, but since I already own an H-Alpha filter can I add a OIII filter to the wheel and take half the images with one and half with the other and then stack them to get the same effect?

 

I don't know, but will this work?

 

Thank you


Edited by By-tor, 30 November 2020 - 08:29 AM.


#2 DRK73

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Posted 30 November 2020 - 08:32 AM

Honestly, if you're thinking about getting a wheel and separate H-a and OIII filters, you might be better served just going full monochrome. I mean - I do now use a 533 and an L-extreme and I accept the limitations of this setup and knew them full well before going in - and am happy with the choice I made (going OSC rather than getting all the different filters and equip for my SBIG). 

 

I *don't* think it's a bad idea to use a wheel if, like you said, you want to change out the H-a and put in a broadband filter or something since doing so would help limit dust getting into the system and I might do the same, myself for my L-extreme and L-pro. I've also got an H-a filter that I'm not currently using and I guess I could drop it in there, too...

 

Have you tried imaging in just H-a with your 533? It might produce pretty clean images, but that's because in emission nebula the H-a signal is going to be really strong (relatively speaking). The OIII signal on the other hand is usually not, so when you're limiting your efficiency using a OSC and only grabbing blue/green light, I'd think the images would be really noisy compared to imaging OIII using a monochrome camera (?) I haven't tried this, though...

 

In the past I have done HOO stuff with monochrome CCD with H-a and OIII filters, and you usually have to get considerably more exposure time in the OIII channels and I just imagine this would be a LOT harder to do with a OSC... 


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#3 By-tor

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Posted 30 November 2020 - 08:42 AM

Yes I have been imaging with the H-Alpha filter and it does seem to work well...

 

Here are a couple of images I have taken using it.  I'm very new to this and hope to get better as I get along in the hobby.

 

Thank you

 

 

Elephant Trunk Nebula_.JPG

 

 

 

 



#4 By-tor

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Posted 30 November 2020 - 08:43 AM

Rosette Nebula 2.JPG



#5 Huangdi

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Posted 30 November 2020 - 09:15 AM

It's going to work perfectly fine. But if you used an L-Extreme, you'd save 50% time...
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#6 By-tor

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Posted 30 November 2020 - 09:17 AM

It's going to work perfectly fine. But if you used an L-Extreme, you'd save 50% time...

Very true....  ty

 

Are there objects you would only use OIII on?


Edited by By-tor, 30 November 2020 - 09:18 AM.


#7 DRK73

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Posted 30 November 2020 - 10:20 AM

Very true....  ty

 

Are there objects you would only use OIII on?

The squid smile.gif

 

Also - planetary nebula I think tend to have lots of OIII


Edited by DRK73, 30 November 2020 - 10:22 AM.

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#8 By-tor

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Posted 30 November 2020 - 10:23 AM

The Pleiades also....



#9 DRK73

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Posted 30 November 2020 - 10:56 AM

The Pleiades are reflection nebula, I wouldn't expect any OIII or H-alpha.


Edited by DRK73, 30 November 2020 - 10:56 AM.

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#10 Huangdi

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Posted 30 November 2020 - 11:04 AM

The squid smile.gif

Also - planetary nebula I think tend to have lots of OIII


Even though PNs might have lots of Oiii, there almost always is Ha present.

I can't think of a single target where Oiii only would be better than capturing both.
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