Omega CaK stack

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Merlin66
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Omega CaK stack

Post by Merlin66 » Tue Oct 10, 2017 12:05 am

This stack appears to work well and gives a pretty clean and clear image.......BUT
I'm struggling to find an exposure/ gain/ gamma setting either in FireCap or SharpCap which gives acceptable frame rates (with the ASI 174MM)
Definitely better results with lower gain settings.
Can you share your exposure setting for the CaK filter you use?????
Any input appreciated.
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marktownley
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Re: Omega CaK stack

Post by marktownley » Tue Oct 10, 2017 5:24 am

I always run neutral gain, with the gain ramped up (power the camera by noise free battery) and the exposure as short as possible, maybe 1-2ms @ f10.
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Merlin66
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Re: Omega CaK stack

Post by Merlin66 » Tue Oct 10, 2017 5:41 am

Mark,
Thanks.
What would you call "neutral gain settings"??
I realise there are differences between FireCap and SharpCap.
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"Astronomical Spectroscopy for Amateurs" and
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Montana
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Re: Omega CaK stack

Post by Montana » Tue Oct 10, 2017 7:49 am

I think neutral 'gamma' was meant
Alexandra

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marktownley
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Re: Omega CaK stack

Post by marktownley » Tue Oct 10, 2017 8:56 am

It was! neutral gamma - it's me typing just after I woke up this morning :D
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Valery
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Re: Omega CaK stack

Post by Valery » Tue Oct 10, 2017 5:36 pm

Merlin66 wrote:
Tue Oct 10, 2017 12:05 am
This stack appears to work well and gives a pretty clean and clear image
Hi Ken,

Can you, please, describe this stack as detailed as possible?

Thanks,

Valery
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Re: Omega CaK stack

Post by Merlin66 » Tue Oct 10, 2017 9:20 pm

Valery,
It's a stack of three Omega filters - <390nm UV cut, 80nm 394nm cwl, and a 2A 393.7nm cwl. All adapted to 1.125" filter size.
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.yahoo.com/neo/groups/ast ... scopy/info
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

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