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Author Topic: ngc1491 puzzle  (Read 1538 times)

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Offline astrorick

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ngc1491 puzzle
« on: 23:42:03, 08 December, 2011 »
This is a combine of 22x600 sec  with a baader ha 7nm filter,the subs all look fine, is only when you combine them that this happen?? any ideas , I never had this problem before...

Rick :(
Mount: MESU 200
Telescopes: Gso 10" RC f8 , Cff 12" RC f8, 80mm f6 TS apo,  8" Vixen VC200L f9, Tamron camera lens 300mm f2.8.
Camera: SBIG ST2000XM, SBIG STF8300M, SBIG ST7,Moravian G316200,Starlight Xpress Lodestar Autoguider  ,TSO AG9 Off Axis Guider

Offline roundycat

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Re: ngc1491 puzzle
« Reply #1 on: 10:57:40, 09 December, 2011 »
what combining method?

Dennis

Offline Einari

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Re: ngc1491 puzzle
« Reply #2 on: 12:24:32, 09 December, 2011 »
They are dark pixel & noice trails.
Like Dennis hints another stacking method might suite better.
You have not used darks/flats/bias frames ?
Tapio

Celestron C8, C9.25" & Hyperstar, iOptron CEM60-EC, TS 80 triplet,  Coronado PST, SXV-694,  ASI120MM/ASI174MC Cool

Offline astrorick

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Re: ngc1491 puzzle
« Reply #3 on: 16:57:39, 09 December, 2011 »
I combine my images in CCDstack  and this is a SUM combine , this is what I have always used,I have try a MEDIAN combine and it looks much better , something went wrong samewere..   See what happen next time I take more data

Many thanks      Rick      (yes I have used dark and flats)
Mount: MESU 200
Telescopes: Gso 10" RC f8 , Cff 12" RC f8, 80mm f6 TS apo,  8" Vixen VC200L f9, Tamron camera lens 300mm f2.8.
Camera: SBIG ST2000XM, SBIG STF8300M, SBIG ST7,Moravian G316200,Starlight Xpress Lodestar Autoguider  ,TSO AG9 Off Axis Guider

Offline roundycat

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Re: ngc1491 puzzle
« Reply #4 on: 17:46:17, 09 December, 2011 »
For what it's worth I would not touch a Sum or Average (much the same really) with a barge pole. I always use MaxIm and always stack with SD Mask. It has good control over single events per frame and cleans up background noise nicely. The idea of using both Median and Average in the same stack depending on how much pixels depart from the Mean is a good one.

Dennis

Offline blinky

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Re: ngc1491 puzzle
« Reply #5 on: 20:15:33, 09 December, 2011 »
Dont ever use the Sum method - it simply adds up the values of all the pixels so it does nothing to remove noise, it simply adds it all up! 

Offline astrorick

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Re: ngc1491 puzzle
« Reply #6 on: 15:26:43, 10 December, 2011 »
Thanks everyone,I think the problem was my dark frames ,   because it looks much better with no calibration  at all

thanks again ..  Rick :happy:
Mount: MESU 200
Telescopes: Gso 10" RC f8 , Cff 12" RC f8, 80mm f6 TS apo,  8" Vixen VC200L f9, Tamron camera lens 300mm f2.8.
Camera: SBIG ST2000XM, SBIG STF8300M, SBIG ST7,Moravian G316200,Starlight Xpress Lodestar Autoguider  ,TSO AG9 Off Axis Guider

 

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