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  1. Galleries
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  4. » NGC 7000 - North America Nebula

 
NGC 7000 - North America Nebula...

Astrografia

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NGC 7000 - North America Nebula sent on August 28, 2013 (18:25) by Fabercom. 13 comments, 1388 views.

, Posa B f/4.0, ISO 800, tripod.

Montatura: Sw Eq6 pro Obiettivo: Canon 70-200 f/2.8 is usm impostato a f/4 Reflex: Canon 5d mark II con modifica filtro Baader Guida: Lacerta Stand alone a fuoco di un cercatore 9x50 Celestron N° scatti: 25 raw da 210 secondi Velocità iso: 800 Dark: n°15 Flat: n° 22 con flat box autocostruita Bias: n°20 Temperatura: 20° circa Elaborazione e conversione a 16 bit: Dss Post produzione e conversione 8 bit: Photoshop cs6 64bite (correzione livelli, curve, e maschera di contrasto)





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avatarjunior
sent on August 28, 2013 (18:32) | This comment has been automatically translated (show/hide original)

I'm a beginner, massacratemi.
Posted version is also redder.

avatarsenior
sent on August 28, 2013 (18:58) | This comment has been automatically translated (show/hide original)

Novice?? do not believe it! :-D I would say great, I could not get as good as you did Hello!

avatarjunior
sent on August 28, 2013 (19:20) | This comment has been automatically translated (show/hide original)

are a bit 'of years that I am passionate but only by mochi months I purchased the guider and I'm doing the first tests. Elio here on the forum will have boxes full of my constant questions.

avatarsenior
sent on August 28, 2013 (19:55) | This comment has been automatically translated (show/hide original)

Fabrizio, is very beautiful, but it has an unnatural white vignetting. It 'true that the area is full of stars, but the corners appear as opaque, do not know if I get the idea. Perhaps the correction with the flat did not work to perfection. For the rest, however, I like a lot, red is the right one. The red version instead, it is too red, this is definitely better.

hello!

Chiara


avatarjunior
sent on August 28, 2013 (20:54) | This comment has been automatically translated (show/hide original)

Chiara, you're absolutely right.
I realized the self-built flat with a flat box.
I summed it all with dss, later in Photoshop pulling out the signal I noticed this too much light at the edges, I tried to darken it a bit 'and lost of sharpness. I also cropped by 20%.
Frankly're the second I talk about flat wrong. I have too little experience to understand what caused the problem.
With a full-frame sensor is always a mess to manage the vignetting.
Clare will send you the file if you want to autosave out by dss and see what went wrong, but weighs 170 megs.

avatarsenior
sent on August 29, 2013 (0:19) | This comment has been automatically translated (show/hide original)

Quoto clear :-) but it remains a valuable work very good :-)

avatarjunior
sent on August 29, 2013 (1:32) | This comment has been automatically translated (show/hide original)

Thank you.

avatarsenior
sent on August 29, 2013 (12:28) | This comment has been automatically translated (show/hide original)

You do not need the file to 170 mega ;-)! Surely you can see that there is a sort of over-correction of vignetting, certainly with a big sensor is more difficult to manage. I think the problem is in the flat, rather than in the image. I would try to draw the whole thing without flat to see what changes and exclude the error and then you have to think on both the capture process than on the flat. The flat must never be saturated, I use the camera to automatically get it and then exclude the color component in the pipeline, because they have to be neutral and the light of flatbox may not be. The problem may also be in the flatbox must be flat for real, if there are other areas more enlightened or not, that's fine. How did you made?

hello!
Chiara

avatarsenior
sent on August 29, 2013 (14:25) | This comment has been automatically translated (show/hide original)

FABULOUS this shoot! And thank goodness you're a beginner ... ;-)

avatarjunior
sent on August 29, 2013 (15:59) | This comment has been automatically translated (show/hide original)

Clear, the flat box is a friend, I do not know if I would be able to achieve it.
I wanted to ask 2 things:
1) which means that it uses the camera to automatically get the flat?
2) What is the flat must not be saturated? You mean overexposed?

Thank you.

avatarjunior
sent on August 29, 2013 (15:59) | This comment has been automatically translated (show/hide original)

Thanks to you too ;-) Johnjz

avatarsenior
sent on August 30, 2013 (11:12) | This comment has been automatically translated (show/hide original)

For the flat box you find online all sorts of suggestions, I visited a bit 'of pages and put together the ideas for how to do it served to me. The material is cheap and the electrical part is a simple circuit of LEDs in series with a potentiometer to adjust the brightness. If you want to challenge themselves and you need some information, are available.
Sorry, I stated: automatically mean that imposed for the camera in aperture priority (Av) and let her choose the appropriate shutter speed. Yes, exactly, I mean for saturated overexposed.
As for your flat, for mathematical reasoning, it would seem that it was darker at the edges of what is needed, so when you split the image to get the flat edges lighter than the center. If so it means that the flatbox is illuminated at the center that the borof, which can easily happen if the light source is central and not well diffused.
hello!
Chiara

avatarjunior
sent on August 30, 2013 (18:52) | This comment has been automatically translated (show/hide original)

Chiara thanks for everything. ;-)


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