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Author Topic: CLS filter for luminance on mono CCD?  (Read 329 times)

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Offline michaelmorris

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CLS filter for luminance on mono CCD?
« on: 20:49:58, 18 March, 2017 »
I'm just starting off on the rocky road that is imaging with a mono CCD camera. I'm planning to use the Atik 460EX camera for RGB and narrowband imaging from my light polluted back garden.

I know that many people use LRGB imaging and use an IR cut filter when acquiring luminance data. From my light polluted back garden I was planning on utilising a light pollution reduction filter such as the CLS-CCD filter to help capture my luminance data for open clusters, reflection nebulae and galaxies.

Has anyone got experience of using filters such as the CLS -CCD filter for taking luminance data on a mono CCD?
What is your experience?

Thanks

Offline Einari

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Re: CLS filter for luminance on mono CCD?
« Reply #1 on: 08:39:26, 19 March, 2017 »
I normally use Idas LPS for my luminance images and use it with rgb too.
Tapio

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Offline PaulB

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Re: CLS filter for luminance on mono CCD?
« Reply #2 on: 09:09:04, 19 March, 2017 »
Hi Michael

I use a Astronomik CLS Light Pollution Filter 1.25"
https://www.telescopehouse.com/astronomik-cls-light-pollution-filter-1-25.html?gclid=CIKmr-ab4tICFYyRGwod7fsFYg

It is very good. And worth every penny.
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Offline chris.bailey

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Re: CLS filter for luminance on mono CCD?
« Reply #3 on: 09:50:11, 19 March, 2017 »
Hi Michael

I certainly see the logic of using a LP filter in place of of a Luminance (not clear) filter. Just make sure that whatever filter you decide to use does have IR/UV cut.

RGB filters are 'notched' in their transmission curves to attenuate the common LP emission lines so I see less logic in the practice of using an LP filter in front of the filter wheel so that it works for RGB too. Stacking filters can also lead to reflection halos.

To start with I would try just collecting RGB. Adding L into the mix significantly increases the chances of something going wrong and adds to the post processing challenge.

Chris

ps don't expect the LP filter to be par focal with the RGB filters, in fact don't expect any filters to be par focal even if advertised to be so.
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