Ha filter with modded DSLR?

[carastro]

Just found this thread. I have just got myself a 12nm Astronomik filter for my 450D.

I have been doing some googling, and it appears 900secs is about the right length for the subs @ 1600 ISO does any-one disagree with this.

Psychobilly:

Yep they are red and you pull out just the R channel form the RGB image...

Just wondering how you pull out the red channel, do you just switch the other channels off and re-save?

Carole

[GlassWalker]

The sub length depends on your subject, the sky conditions and speed of optics as well... so there isn't a single answer.

I use Nebulosity as a batch pre-processor before align and stack. Depending on what other software you use, it could help prevent confusion that may result from having the other redundant colour channels.

[Shibby]

Just wondering how you pull out the red channel, do you just switch the other channels off and re-save?

I stack using the "super pixel" debayer mode. Then, in PS, I just delete the G and B channels then change the image to greyscale.

[Ken82]

Does the Baader uhc filter qualify as a narrowband filter ?? It does say for photographic use on the case. Also the number 7nm relates to the pass width of the filters ? 

[ollypenrice]

9 minutes ago, Ken82 said:

Does the Baader uhc filter qualify as a narrowband filter ?? It does say for photographic use on the case. Also the number 7nm relates to the pass width of the filters ? 

A UHC is a broadband filter intended to subdue skyglow, mainly for visual use. They were also used by film imagers. I don't know of anyone using them for digital imaging.

The 7nm does indeed mean that the passpand is 7nm wide.

Olly

[Mick J]

I suppose you would need to look at the graph to see what range the passed light is in and compare with Ha filters etc and what light you want/need to capture.

Edit :   Just found this    and  this

[Ken82]

Thanks  would the astronomink 12nm be better for me than the Baader 7nm with a modified canon 6d ??? I can't find a uk supplier for the 12nm ??? I was thinking to just buy the Baader filter set but without a ccd some of the filters would be wasted ?? 

 

http://www.firstlightoptics.com/narrowband/baader-narrowband-ccd-emission-line-h-alpha-filters-2.html

 

 

[Mick J]

As you have the UHC filter why not give it a go, perhaps you have been using it?

I am not an astrophotographer,  perhaps better advice is available/advisable. 

[Ken82]

Yea thanks Mick I will have a bash ! Although it is more a light pollution filter than anything . Visually it's actually quite good  

[geordie85]

20 hours ago, Ken82 said:

Thanks  would the astronomink 12nm be better for me than the Baader 7nm with a modified canon 6d ??? I can't find a uk supplier for the 12nm ??? I was thinking to just buy the Baader filter set but without a ccd some of the filters would be wasted ?? 

 

http://www.firstlightoptics.com/narrowband/baader-narrowband-ccd-emission-line-h-alpha-filters-2.html

 

 

Tringastro.co.uk and rother Valley optics both sell the astronomink 12nm Ha clip filters.

I'm not sure which nm would be better but I'm pretty sure the lower the nm number, the longer the subs you'll need but I'm not 100% sure on this

[Ken82]

Thanks Geordie , I can't use the clip filter unfortunately as I'm using a full frame 6d . I might just get the Baader 2" filter set 

[craigg]

 

On 10 February 2016 at 13:33, Ken82 said:

Thanks Geordie , I can't use the clip filter unfortunately as I'm using a full frame 6d . I might just get the Baader 2" filter set 

 they do XL version of the clip filters now by the way, suitable for full frame sensors.  More £££ obviously!

[michaelmorris]

I use a 'poor-man's Ha filter' with my modded 1100D.  The camera has a semi-permanently mounted Hitech IDAS filter.

http://www.firstlightoptics.com/light-pollution-reduction-imaging/idas-mfa-filter-adapter-kit-for-canon-eos.html

If I then add a Red filter with a sharp with a sharp cut off , I end up with a broadband Ha filter.

See - http://www.firstlightoptics.com/light-pollution-reduction/idas-narrow-band-nebula-lps-v4-filter.html