LRGBC filters for imaging

[Kai]

Hi

I am looking at getting a set of the new Baader LRGBC filters from FLO http://www.firstlightoptics.com/proddetail.php?prod=Baader_LRGBC_filter_set to complement my Baader narrowband filters.

Just one question though is "do i really need the uv/ir , clear glass filters ???"

As i will be using the filters in a filter wheel when would i need to use the uv/ir filter ????

Cheers

Steve

[MartinB]

Isn't that your luminence filter Steve?

The issue for this set is finding a suitable par focal ir blocking LP filter, if you need one that is. You could use an IDAS or CLS in place of your luminence but they won't be par focal. Not the end of the world if you are happy to tweak the focus when you change from RGB to L. Do Baader make a suitable filter. Is the neomydium par focal?

[Kai]

Martin

The set comes with a clear glass filter as well , i thought that i could use that as luminence or i do have a Cls.This is why i am a bit confuddled

[MartinB]

I don't think the set will have an LP filter, just the 3 colours and the clear IRblocking luminence.

[Kai]

The set comes with a clear glass and a uv/ir filter and i already have a Astronomik Cls filter.

So i take it i would use the uv/ir OR the Cls for luminence thus causing the clear glass filter to be redundant. :scratch:

[MartinB]

The clear glass filter would be good with mirror optics where the IR isn't such an issue.

[Kai]

So i could use the Clear glass with my C8sct and the UV/IR , CLS with the ED80 .....yes

Cheers Martin

[MartinB]

I reckon so Steve. The clear filter will then simply be to maintain par focality of the luminence.

[Kai]

Cool

It looks like i have a fair learning curve this season then , what with a new CCD on the way and taking my first steps into colour imaging .....

Do you fancy a weekend down in sunny Kent ??? (the french red wine markets are only a hour away)

Thanks again Martin

[MartinB]

Guarantee the sunshine and I'm on my way!

[Kai]

Just a follow up question if i may.....

Does anybody know if the Baader Narrowband filters are par focal with the above set ????

[FLO]

I asked Baader in Germany the same question. They said the new Baader Narrowband CCD Emission Line & H-Alpha Filters are parfocal with each other, as are the new Baader LRGBC CCD Filters. But, the narrowband filters are not necessarily parfocal with the LRGBC filters. However, there was a pause when I asked so I made a mental note to ask them again when next I spoke. I'll try again tomorrow.

[Kai]

Cheers Steve

I have a Ha and OIII Baader filter but they are about 18 months old so i not sure if they are the new narrowband filters.

[FLO]

They probably aren't. Do you know their bandwidth?

[Kai]

This one

http://www.firstlightoptics.com/proddetail.php?prod=boIII

and

A Baader 7nm Ha Filter