Horsehead in Ha

[Mosc_007]

Tried out my Ha filter on the Horsehead Nebula last night. Does make a huge difference as the Ha filter leaves no sky glow. The Red stars are caused by the Ha filter.

6 Subs at 5 Min each. Celestron C11 with F6.3 Focal reducer. Modded Canon 1100D. Taken at Linden 19/09/2014

As suggested I separated the RGB Channels and added an Image of just the red channel in B&W.

[jsmoraes]

Good image. Very clean. :thumbsup:

[MrB]

Nice work Charles, tho I reckon it'd look better if you discarded the blue and green channels and displayed it in mono :thumbsup:

[Mosc_007]

Thanks. The Larger scope and the Ha filter has improved it a lot.


Charles

[Mosc_007]

Thanks for the tip. I will separate the RGB Channels and see how it looks in B&W. I do like Color though :)

I have added an Image of just the Red channel in B&W. I does show the errors in the image more in B&W though.


Charles

[MrB]

Yeah it is personal preference, but your mono version does seem to reveal more detail that was hidden in the colour :thumbsup:

[raymo]

Looking good. I think that the horsehead is the only DSO that I prefer in
B&W.
raymo

[jsmoraes]

Frames with narrow band filter have limitation of information. We just use these filters for this. Alone they hidden many informations.

They are very important when used as complement to a RGB image. To boost some details or structures.

They can be used to create some special presentation of the object. Bi-color, Hubble palette, ESO palette, crazy palette ... Some are very useful to show specifc details of object. Others, only to present a beautiful and impressive photo.

For amateurs the H alfa, O 3 and S 2 are most usual. But some others filters more professional brings amazing and astonishing informations: http://www.nasa.gov/chandra/multimedia/puppisA-2014.html#.VB66yVdJdNt

[Mosc_007]

Thanks for your information. I have Ha, O3 and S2 filters. I tried using these 3 filters on Helix Friday night but was not happy with the results. I need to do a lot of testing and learning to use these types of filters. I think Horeshead may only have Ha light so it was ok. I will have another go at helix with the Ha,S2 and O3 when I get a chance. It may also not be good to use a OSC camera with these filter. Or maybe do Color and add the filters as well. Lots to learn with narrow band filters.


Charles

[Amaranthus]

Helix emits very little in the SII band - I recently tried to milk what I could out of that filter (I went deeeeeeep) but still not much joy - in hindsight, I shouldn't have bothered. The action is all in Ha (rim) and OIII (centre) for NGC 7293...

[Mosc_007]

That is what I found. Ha was good as was O3, But the O3 might have been over exposed. The S2 had almost no data. The problem I have is to combine the Ha and O3 after stacking them seperatly. When I tried to combine them in PSP the image looked like crap. I need to learn how to combine them properly.


Charles

[jsmoraes]

Charles, I invite you to see some movies tutorials from Ken Crawford. Popcorn, Coke and enjoy them:

http://www.imagingdeepsky.com/Presentations.html

[Mosc_007]

Thank you. I will have a good look at them.


Charles

[BruceG]

Hi Charles - I love the horse head! and yours in particular is great!
Ha presented in monochrome is really very nice. That C11 is working well for you and you appear to get pretty accurate guiding considering you move everything to Linden. What system do you use for PA?
Bruce.

[Mosc_007]

I think the processing could have been better. That was also a rushed image. It was 3.00am and I was about to go home and decided to have a go at Hosehead in Ha. Came out nice. But I am sure with better processing and more subs I can do better with the C11.

Hehehe. My Polar align is usuly not the best. Most of the time i just use a compass to set the mount up as close as I can to the South Celestial pole. And the Elevation is set with a pretty accurate digital level.

I have been using an Orion ST80 with an Orion Starshoot Pro for the Guiding. With the C11 I also bought a Losmandy G11 G2. When I was doing the Tarantual last sat night the guiding was mostly holding 0.5 Arc seconds.


Charles