Imaging with new mono CCD camera.....questions...

[Astroboffin]

Hi all,

I have just bought myself a secondhand CCD camera, to try some imaging.

I have been using a DSLR astro modded, with the AStronomik CLS clip LP filter which works extremely well.

My query is, in the modded DSLR without the CLS filter if I take a daytime pic it has the red Tinge, as it should because of the extra sensitivity to Ha, and the CLS filter corrects this and gives me near perfect colour balance if I take the same picture with that filter in, it comes out almost normal, colour wise.

So would it be the same for a OSC CCD camera, if it was possible to take the same daytime pic would those pictures come out with the same red tinge, as there are no filters In front of the sensor, and so would a CLS filter do the same job for my CCD, (restore colour balance) ??

I know I would need the CCD version of the filter that has IR cut.

And would I need a LP filter on a mono CCD camera, or not as it is mono?

Many thanks

AB

[ronin]

Title says mono, so no red tinge, just black, white and shades of grey.

Even with Red, Green, Blue filters in all you get is a black and White image, you tell the software that the levels obtained in the B&W image should be translated to levels in the appropriate "colour".

Means you can sort of rotate them round and get a different result if you want.

[Astroboffin]

Title says mono, so no red tinge, just black, white and shades of grey.

Even with Red, Green, Blue filters in all you get is a black and White image, you tell the software that the levels obtained in the B&W image should be translated to levels in the appropriate "colour".

Means you can sort of rotate them round and get a different result if you want.

Hi, Thanks for that, that is what I thought for the mono

But I messed up in the title, and can't edit yet, so what about the questions for the OSC CCD cameras, would they show the same tinge of red if able to take daytime images?

Regards

AB

[Astroboffin]

And surely even with a mono camera a LP filter will help the images, as I wouldn't want LP in the image at all, won't that then show up when producing the RGB image in the end, I know it will show as probably grey in the mono images, but when converted into RGB will it not be there then, as a colour cast, like i get when taking an image with a OSC CCD camera, and no LP filter?

Hope that makes some sense......

Regards

AB

[redmoo]

And surely even with a mono camera a LP filter will help the images, as I wouldn't want LP in the image at all, won't that then show up when producing the RGB image in the end, I know it will show as probably grey in the mono images, but when converted into RGB will it not be there then, as a colour cast, like i get when taking an image with a OSC CCD camera, and no LP filter?

Hope that makes some sense......

Regards

AB

When you use a mono camera, you need some sort of filter in there, be it an LRGB set or a narrowband set. These filter out the LP on their own as each filter will only let through a certain bandwidth of light. 

That is next on my list. Which camera did you go for?

[lukebl]

As I understand it, unless you're using Narrowband filters, you will need a Light Pollution filter. Well, I use one anyway.

[redmoo]

I guess it depends on the filters that you are using and the light pollution type that is in your area. The new LED lights are a nightmare for LRGB imaging. 

Some of the RGB filters have a gap between the red and the green filters to drop out the 589 line from sodium lamps. Don't know what you would do about lum though!

[Astroboffin]

So to ask my first question again, will an AStronomik CLS light pollution filter on a OSC CCD camera, have the same effect as on an astro modded DSLR, and correct the colour balance??

Regards

AB

[Thalestris24]

So to ask my first question again, will an AStronomik CLS light pollution filter on a OSC CCD camera, have the same effect as on an astro modded DSLR, and correct the colour balance??

Regards

AB

Hi

I use a lp filter with my osc. Obviously one normally takes a number of subs, stack them and post-process the result. Colour balancing can be done during the post processing. The response to certain colours/wavelengths varies according to the particular camera sensor and won't be the same as a dslr. 

Louise

[lensman57]

Hi all,

I have just bought myself a secondhand CCD camera, to try some imaging.

I have been using a DSLR astro modded, with the AStronomik CLS clip LP filter which works extremely well.

My query is, in the modded DSLR without the CLS filter if I take a daytime pic it has the red Tinge, as it should because of the extra sensitivity to Ha, and the CLS filter corrects this and gives me near perfect colour balance if I take the same picture with that filter in, it comes out almost normal, colour wise.

So would it be the same for a OSC CCD camera, if it was possible to take the same daytime pic would those pictures come out with the same red tinge, as there are no filters In front of the sensor, and so would a CLS filter do the same job for my CCD, (restore colour balance) ??

I know I would need the CCD version of the filter that has IR cut.

And would I need a LP filter on a mono CCD camera, or not as it is mono?

Many thanks

AB

Mono CCD records all wavelengths of light with great efficiency including the dreaded LP bands so stick an LP filter on for Luminance imaging or an Ha if you want to do NB.

A.G

[Astroboffin]

Mono CCD records all wavelengths of light with great efficiency including the dreaded LP bands so stick an LP filter on for Luminance imaging or an Ha if you want to do NB.

A.G

Hi,

Thanks for that, what LP,is the best for CCD cameras, I use a clip in AStronomik on my DSLR, but hey do shift the colour balance a bit, on an unmodded camera, will it work the came on a CCD??

Regards

AB

[Thalestris24]

Hi

Well you obviously can't use a clip filter with a ccd though a non-clip equivalent should be ok. As I said any colour shift caused by a lp filter is not of any consequence.

Louise

[lensman57]

Hi,

Thanks for that, what LP,is the best for CCD cameras, I use a clip in AStronomik on my DSLR, but hey do shift the colour balance a bit, on an unmodded camera, will it work the came on a CCD??

Regards

AB

Clip filter actually has a spectral response curve that is very similar to most of the nebula filters on the market, these allow Hb, Oii, Nii, Ha and Sii and block most of the stuff in the middle so in some cases it maybe a bit of an overkill. The best all around LP filter is IDAS P1 for a mono camera but these are pricy, you may wish to use a Baader Neodymium if your LP is low to moderate and this one also helps with Moon glow if Mr moon is about  a quarter or less and away from your target. There is an adapter from TS that adapts  the Astronomic clip to a 2" fitting but you have to do your own research with this as I am sure this will cause vignetting with larger CCDs or a DSLR as the filter will have to be moved forward.

A.G

[Astroboffin]

Clip filter actually has a spectral response curve that is very similar to most of the nebula filters on the market, these allow Hb, Oii, Nii, Ha and Sii and block most of the stuff in the middle so in some cases it maybe a bit of an overkill. The best all around LP filter is IDAS P1 for a mono camera but these are pricy, you may wish to use a Baader Neodymium if your LP is low to moderate and this one also helps with Moon glow if Mr moon is about  a quarter or less and away from your target. There is an adapter from TS that adapts  the Astronomic clip to a 2" fitting but you have to do your own research with this as I am sure this will cause vignetting with larger CCDs or a DSLR as the filter will have to be moved forward.

A.G

Thanks for the advice,

My LP where I live is moderate I would say, I have a dark back garden with no street lamps or flood lights on view, I looked at the baader N filter, so I may have a closer look at that, I did not realise it was good with LP, is it advertised as a LP filter?

I could use my clip filter as I have a 2" filter cell that is empty, I think it would fit that, my CCD camera has the 2/3" sensor the same as the Atik 314 camera, so vignetting should not be a problem.

I just don't want to be spending a small fortune on another LP filter.

Regards

AB

[Astroboffin]

Would I also need an UV/IR filter with a mono CCD, or at least an LP filter with the UV/IR cut built into it?

AB

[Thalestris24]

Hi

The kind of filters you'd use with a mono camera would include UV/IR cut but if you are taking luminance exposures you'd need an lp filter with UV/IR cut.

Louise

[DaveS]

I actually find the Astronomik CLS filter better at knocking out LP than the IDAS P2, though that's just going by eye, as I've only been doing NB up to now. With galaxy time coming round I've put my CLS in the imaging train, but I may try the P2 for comparison.

The Baader L filter from their set has IR and UV cut so you may not need additional iR filtration.

[Thalestris24]

The Baader L filter from their set has IR and UV cut so you may not need additional iR filtration.

Yeah, but if you have bad lp you'd need a filter for that also

[DaveS]

Oh, yes, I meant in addition to the LP filter.