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First light on horsehead nebula with SW 120 ED

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#1 neptun2

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Posted 05 February 2013 - 09:59 AM

Hello guys. Yesterday i finally managed to sort the problems with my new setup and take 10 5min exposures at ISO 1600 of the horsehead nebula and flame. I used nikon d90 modified dslr and skywatcher 120 ED refractor on heq5 pro mount and with off-axis guider and meade dsi 2 pro as gudie camera. Here is the result:

Posted Image

It is far from perfect but the first time when autoguiding works ok with the new scope so i am relatively happy with it.

#2 fishonkevin

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Posted 05 February 2013 - 01:06 PM

Looks like you got things going pretty good.

#3 srosenfraz

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Posted 05 February 2013 - 05:09 PM

Nice job on this - congrats on the new scope!

#4 neptun2

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Posted 06 February 2013 - 04:26 AM

Thank you. I have a lot to learn about processing yet but it encouraging first light with the new scope.

#5 Skyshooter

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Posted 06 February 2013 - 08:26 AM

Beautifully composed and framed. Ain't it great when things just work? Way to go...

Cheers,
Ed

#6 mmalik

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Posted 06 February 2013 - 09:12 AM

Dim looking first light, but good attempt after all.

#7 jwheel

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Posted 06 February 2013 - 10:00 AM

Nice shot!

#8 neptun2

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Posted 06 February 2013 - 10:54 AM

I could pull out more detail from the raw data but unfortunately the noise becomes too high. If i could capture 10 more frames for example this would allow me to stretch the details further.

#9 neptun2

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Posted 06 February 2013 - 03:20 PM

Thank you for good words and suggestions. Here is another version with better sharpness , contrast and detail but also with higher noise visible.

Posted Image

#10 neptun2

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Posted 01 March 2013 - 10:39 AM

I tried the LLRGB method and here is what i got:

Posted Image

#11 Nils_Lars

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Posted 02 March 2013 - 02:04 AM

A successful first light id say , the reprocess worked well also.

#12 srosenfraz

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Posted 02 March 2013 - 06:09 PM

Your reprocess pulled out a lot of the fainter parts - nice job. One of the things that I can see with the reprocess is that the image appears to have some degree of vignetting (its not as obvious in the darker first version). Are you using flats with your calibration?

#13 neptun2

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Posted 03 March 2013 - 05:06 PM

Yes there is vignetting. Unfortunately i did not take flats so i can't correct it properly. Maybe i had the prism of the off-axis guider too inwards and this caused vignetting in one of the corners. I am also waiting for one t-thread spacer to make the distance between flattener and sensor correct. Maybe this also causes vignetting.

#14 srosenfraz

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Posted 04 March 2013 - 01:41 AM

Irrespective of what's the cause of the vignetting, my suggestion would be that you should always take flats. They'll go a long way towards compensating for any vignetting, even if its just minor vignetting. I think its just good practice, and its never going to hurt your images to take flats.

#15 neptun2

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Posted 04 March 2013 - 02:38 AM

Well i will definitely consider that next time. I have never taken flats - only darks but will maybe reconsider that.






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