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 Post subject: Flame and Horse Head
PostPosted: Tue Mar 08, 2011 8:51 pm 
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Location: Bristol, UK
I managed to get out last night and try my hand at the Flame and Horse Head Nebula in Orion.

I took a total of 12 x 600s but only 7 darks. I think I need to add a few more darks to this.

10 (of 12) x 600s Lights stacked in DSS
Darks, Bias and Flats.
Post Processed in CS4

Image

I was really pleased that the horse started to show up. I reviewed a single frame on the camera and could clearly see the Flame and thats it. I was worried weather I had framed the shot right to included it!

This was my first time taking and using flats. They seemed to work well and Im glad I took them as I have a rather large mark on the sensor that looks like a hair or something and the flats took care of that. Out of curiosity I stacked without the flats after to see what the effect was on vignetting and was pleasantly surprised. That is the flats really took care of the vignetting for me.

I think I have come to the limits of my D200 with this object as it was really hard to get any red in it. Also the flame appears to be washed out, almost like a gradient of some sort which I can not get rid of. However, after seeing several images on the internet it appears that this is correct?

Full of noise which I know more subs will help with.

So, what do you guys think?

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 Post subject:
PostPosted: Tue Mar 08, 2011 8:55 pm 
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Location: The Netherlands
I think the picture is really nice! Congrats!

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 Post subject:
PostPosted: Tue Mar 08, 2011 9:15 pm 
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Nice detail. I'm curious about the flame though, since in the shot I got previously it was very red, yet yours is white on red background? The only thing I can think of for now is I have no idea what spectrum it is, and I was using light pollution filter which will be cutting out some large chunks of spectrum.

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 Post subject:
PostPosted: Tue Mar 08, 2011 9:19 pm 
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Thanks guys.

Popo, I don't know what it could be, but I suspect your not far from the truth. I have seen several shots which are like mine and several with the flame being more red.

I do know that my camera isnt all that sensitive to the red spectrum.

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 Post subject:
PostPosted: Tue Mar 08, 2011 9:29 pm 
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The light pollution filter means I will definitely be picking up the red H-alpha, but I might lose any broader spectrum sources. You never mentioned using such a filter so you would be picking up broad spectrum. If I had a clue, I'd look up what spectra these objects give which might give a further clue.

On H-alpha sensitivity, I think most standard cameras are in the same boat. I still want to get a camera modified some time, possible gain of about two stops advantage there! Imagine how much more you could capture.

Edit: I had a quick search around. There's a fair bit of talk about HI and HII I don't quite fully get, and there's as many images in as many light combinations as you can shake photoshop at.

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