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Astrophotography and Sketching >> DSLR & Digital Camera Astro Imaging & Processing

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carlstronomy
super member


Reged: 06/03/12

Loc: Brisbane, QLD, Australia
NGC2024 Flame new
      #6128263 - 10/10/13 01:19 AM Attachment (21 downloads)

Hello to all,

I took 3 hours of data on the flame nebula last night. Processed today and found that I have some sort of reflection. I have attached two over stretched images showing the issue.

Image 1: Is all three hours of data.
Image 2: A trial of only 20 minutes of data.

Darks for each, a set of bias and flats (I even took a second lot of flats today to see if it made any difference that was image 2)

Image train.

Celestron C9.25
Meade 6.3 reducer
Bintel T adapter
Canon 450D

I also have a home made due shield which is lined with black material.

This is the same image train used a few nights ago for my M42 posted below which has no issues and they are both in the same area of the sky. I am in a fairly light polluted area but this has not changed in the last week.

Can someone help with what could be causing this issue and how I can either fix these subs or prevent this happening in the future.

Thanks

Carl


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carlstronomy
super member


Reged: 06/03/12

Loc: Brisbane, QLD, Australia
Re: NGC2024 Flame new [Re: carlstronomy]
      #6128267 - 10/10/13 01:23 AM Attachment (11 downloads)

And this is the second image made up of new flats and only 20 minutes of data.

Thanks for looking

Carl


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Stargazer78
professor emeritus
*****

Reged: 03/05/13

Loc: Susanville California
Re: NGC2024 Flame new [Re: carlstronomy]
      #6128276 - 10/10/13 01:29 AM

I have the same thing in my image.



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Stargazer78
professor emeritus
*****

Reged: 03/05/13

Loc: Susanville California
Re: NGC2024 Flame new [Re: Stargazer78]
      #6128279 - 10/10/13 01:33 AM

I think its a reflection form Alnitak. Either that or we discovered a new nebula lol

The donuts nebula lol

Edited by Stargazer78 (10/10/13 01:38 AM)


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carlstronomy
super member


Reged: 06/03/12

Loc: Brisbane, QLD, Australia
Re: NGC2024 Flame new [Re: Stargazer78]
      #6128287 - 10/10/13 01:45 AM

So can anyone help with how to image the Flame without Alnitak killing it?

Carl


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Stargazer78
professor emeritus
*****

Reged: 03/05/13

Loc: Susanville California
Re: NGC2024 Flame new [Re: carlstronomy]
      #6128300 - 10/10/13 01:55 AM

I asked the same question and I was told to try and frame it out of the picture. But that's not easy!!!!! I would like to know the answer as well!

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nodalpoint
scholastic sledgehammer


Reged: 06/03/13

Loc: FEMA camp
Re: NGC2024 Flame [Re: Stargazer78]
      #6128737 - 10/10/13 10:30 AM

Seems to be light reflecting back from somewhere in the optical tube during the long exposure, possibly off the corrector. Try shooting something like a bright streetlight and see if the reflection shows up in the same place.

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srosenfraz
Post Laureate
*****

Reged: 03/06/11

Loc: United States
Re: NGC2024 Flame new [Re: nodalpoint]
      #6129417 - 10/10/13 04:18 PM

The internal reflection will be symmetrical with respect to the center of the image. If you put Alnitak in the exact center of the frame, then the reflection will be on top of Alnitak (i.e., you won't see it). Of course, this may not give you the framing you want, but that's one solution to eliminating the reflection. The alternative is to put Alnitak farther towards the edge of the FOV (or outside the FOV) so that the reflection lands farther outside of the Flame. Then you can crop out the reflection from the edge of the image. Otherwise, you're left with trying to clean it up in post processing (which isn't always easy to do).

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shawnhar
Post Laureate
*****

Reged: 06/25/10

Loc: Knoxville, TN
Re: NGC2024 Flame new [Re: srosenfraz]
      #6129425 - 10/10/13 04:25 PM

I hate you Alnitaaaaaaaaak~!!

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Stargazer78
professor emeritus
*****

Reged: 03/05/13

Loc: Susanville California
Re: NGC2024 Flame new [Re: shawnhar]
      #6130279 - 10/11/13 01:00 AM

Quote:

I hate you Alnitaaaaaaaaak~!!




lol


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