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Capuring RGB for stars at the same time and prosessing it with Mono Cameras.

ZWO ASI1600MM COOL Filters Acquisition RGB Deep Sky
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Morian avatar
Morian avatar
Hello.
Instead of capturing RGB separately for stars, is it possible with this filter: Antlia Triband RGB Ultra Filter 2" to get RGB at the same time.
I have ASI 1600 MM Pro.
Lynn K avatar
Lynn K avatar
I 've had this filer for awhile, but haven't used it.  It is designed for OSC not mono.  I only do OSC at a dark site.  Looking at the spectral graph it is similar to a dual band filter with the addition of some blue light.  
 
I'm not sure what you are asking.  If you are asking if you can use the Antlia RGB doubled over your regular RGB filters, I'm not sure.  It would greatly reduce the spectrum of light  normally  going through.  The filter will greatly reduce the color spectrum of stars.  I see no benifit of doing so over normal RGB stars, other that fighting gradients.

If you are asking if some how just using the Antlia RGB filter with a mono camera for stars. NO, that will only create a Ha + SII + OIII with some blue Luminance. As a Luminance with a HOO image, it might have some value.

I would think even with an OSC the star color would be limited.

Lynn K.
Morian avatar
Morian avatar
Hey Lynn.
Thank you very much for your response to this filter and yes you are right for mono cameras you can only use it as a kind of extra accessory for luminas with bluish tones I found out.
But at first I thought finally a filter that can record RGB at once on mono sensors but I can only dream and hope it comes one day.
Thanks again for your response.
C.S morian
Tony Gondola avatar
Tony Gondola avatar
Hey Lynn.
Thank you very much for your response to this filter and yes you are right for mono cameras you can only use it as a kind of extra accessory for luminas with bluish tones I found out.
But at first I thought finally a filter that can record RGB at once on mono sensors but I can only dream and hope it comes one day.
Thanks again for your response.
C.S morian

There are, it's called a one shot color camera and the filters are included...
Richard avatar
Richard avatar
Using a tri bandpass filter with a monochrome camera will just produce a single, mono channel image with sources of light from three bandpasses. You won't end up with an RGB image. 

If you captured SHO mono images, there's scripts in Pixinsight which let you create synthetic RGB star colours from SHO star data. 

Here's one method from Seti Astro:
https://youtu.be/UpG6bj68VPw
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Lynn K avatar
Lynn K avatar
As I stated and the above post reiterated, mono chips only record ADU data, no color.  The only way to create color with a mono chip is to shoot through colored filters  and create an RGB image through software computation. 

There will never be such a filter.  The best you can do is obtain RGB filters that are very parfocal or have focal off-sets in a software.  Then let it run.  This is what I do.  I don't dither star data.  I take 30 sec subs x 20/30.  It takes about 45 min.

Lynn K.