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Author Topic: Colour CCD’s and CLS filter’s  (Read 225 times)

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Offline stars_are_cool

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Colour CCD’s and CLS filter’s
« on: 23:19:26, 13 November, 2017 »
Hi all,

I’m in a small town, on the outskirts, in South Manchester, light pollution is a problem to an extent, however the moon is probably more of an issue for me than street lighting!
I’ve been researching filters to aid in this area, and have come across the CLS type.
Is it recommended (and is it straightforward) to use a CLS on my colour CCD (2”)?

Thanks!!
Graham


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Graham.

William Optics ZS61 (...more refractors to follow!)
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Online Roger B

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Re: Colour CCD’s and CLS filter’s
« Reply #1 on: 23:38:10, 13 November, 2017 »
A CLS filter wont do much for moon light.   For this you need to get a Ha filter. 

Rog
Scopes - TS65q, W/O 110 Triplet
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Cameras - SX694, QSI583WSG,Lodestar Guidecam, GP-Cam, QHY5II.
TS 9mm OAG
Quantum 7x1.25 EFW, Baader LRGB,Ha,OIII,SII Filters 
Quark chromo

SGPro, Pixinsight.

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Offline stars_are_cool

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Re: Colour CCD’s and CLS filter’s
« Reply #2 on: 08:20:14, 14 November, 2017 »
A CLS filter wont do much for moon light.   For this you need to get a Ha filter. 

Rog

Cheers Roger, I should have said I was looking at hydrogen-alpha as well, so what I’m hearing is that CLS are for general light pollution and Ha more suited to moonlight... perfect! I’ll get looking...


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Offline stars_are_cool

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Re: Colour CCD’s and CLS filter’s
« Reply #3 on: 19:18:19, 14 November, 2017 »
A CLS filter wont do much for moon light.   For this you need to get a Ha filter. 

Rog

Rog, do you know of any “reasonably” priced 2” Ha filters? What I’m seeing are mainly in the 300-400 quid range (or more), I’m thinking 100 quid or so...max!
I dunno if there is a different type used in filter wheels, but I need one I can use on my colour ccd, 2” fixture.
What I’m seeing are mainly for mono ccd filter wheels...

Thanks mate.
Graham


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William Optics ZS61 (...more refractors to follow!)
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Offline Einari

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Re: Colour CCD’s and CLS filter’s
« Reply #4 on: 19:43:52, 14 November, 2017 »
If you have a 2" nosepiece you can put a 2" filter there.
Here you have couple choices :
https://www.firstlightoptics.com/narrowband/baader-narrowband-ccd-emission-line-h-alpha-filters-2.html
7nm is better for heavy light pollution.
Mind you, you are losing resolution using Ha filter with colour ccd as only red pixels receive data.
But many do it nevertheless, even DSLR users.
Tapio

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Offline stars_are_cool

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Re: Colour CCD’s and CLS filter’s
« Reply #5 on: 20:27:37, 14 November, 2017 »
If you have a 2" nosepiece you can put a 2" filter there.
Here you have couple choices :
https://www.firstlightoptics.com/narrowband/baader-narrowband-ccd-emission-line-h-alpha-filters-2.html
7nm is better for heavy light pollution.
Mind you, you are losing resolution using Ha filter with colour ccd as only red pixels receive data.
But many do it nevertheless, even DSLR users.

Cheers, look like a decent price at least.
I have more research to do, thanks for the comments about the red light. Food for thought.
Yes, my ccd has a 2” nosepiece.


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Offline Nomis Elfactem

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Re: Colour CCD’s and CLS filter’s
« Reply #6 on: 21:15:20, 14 November, 2017 »
Graham, the red light bit is an important one to consider as it in effect means you will only be using 1 pixel out of every 4... if you intend to use it all the time then it's worth considering the mono camera route.

It's also worth noting that the moon is only about two weeks out of every four so if you can't go the mono camera route then I'd probably concentrate on a light pollution filter (CLS) and time manage your way around the moon.

Food for thought.
S.
Simon

Scopes: Astro-Tech AT-111EDT Triplet, TS65ED Quad, Orion ST80, Modded PST-90 Solar Scope, PST Cak (on loan)
Cameras: SXVF H694, Atik 16ic, Canon EOS 600d, DMK41, DMK21, QHY 5L-II (mono & colour)
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Online Roger B

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Re: Colour CCD’s and CLS filter’s
« Reply #7 on: 21:24:52, 14 November, 2017 »
This was captured with a dslr and a clip ha filter.   

Rog
Scopes - TS65q, W/O 110 Triplet
Mount - EQ6 PRO via  Eqmod,  Rowan belt modded
Cameras - SX694, QSI583WSG,Lodestar Guidecam, GP-Cam, QHY5II.
TS 9mm OAG
Quantum 7x1.25 EFW, Baader LRGB,Ha,OIII,SII Filters 
Quark chromo

SGPro, Pixinsight.

************AND NO TIME TO USE IT************

Offline stars_are_cool

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Re: Colour CCD’s and CLS filter’s
« Reply #8 on: 17:46:16, 15 November, 2017 »
Graham, the red light bit is an important one to consider as it in effect means you will only be using 1 pixel out of every 4... if you intend to use it all the time then it's worth considering the mono camera route.

It's also worth noting that the moon is only about two weeks out of every four so if you can't go the mono camera route then I'd probably concentrate on a light pollution filter (CLS) and time manage your way around the moon.

Food for thought.
S.

Very good point re moon, I’ve not bought any filters yet, your advice is great mate very welcomed indeed.
I do have a colour ccd, so I’m not going the mono route... I have a small mono for guiding only.

Thanks again!!

Graham


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Graham.

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Offline stars_are_cool

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Re: Colour CCD’s and CLS filter’s
« Reply #9 on: 17:46:44, 15 November, 2017 »
This was captured with a dslr and a clip ha filter.   

Rog
Rog, that looks awesome...


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Graham.

William Optics ZS61 (...more refractors to follow!)
Skywatcher HEQ5-Pro
Laptop (image processing in StarTools), i7 16gb RAM, SSD

 

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