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  1. Galleries
  2. »
  3. Astrophotography
  4. » Rosette Nebula

 
Rosette Nebula...

Astrofotografia I

View gallery (21 photos)

Rosette Nebula sent on January 21, 2012 (18:09) by Astrogallery. 11 comments, 1605 views.

ISO 800,

Canon 450D (mod. Baader)+ Newton GSO 150/750 su HEQ5 PRO; Somma di 66 scatti da 240 sec a 800ISO + 23 dark + 20 flat.Allineamento e calibrazione con il software DSS (deep sky stacker) e elaborazione con Phostoshop CS4. Qui a risoluzione maggiore http://astrogallery.altervista.org/nebulae/rosette-nebula-ngc2237-.jpg.html





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avatarsenior
sent on January 22, 2012 (18:21) | This comment has been automatically translated (show/hide original)

A beautiful image, but (if I miscalculated!) Have done more than 4 hours of exposure time and like I expected much more, even more so seeing that your camera is modified Baader. Let me explain: there is little nebulous and lots of noise, it seems that the amount of pose collection is much lower than 4 hours declared. Beautiful colors, however, certain that with the Baader filter over the red one goes much quieter! I'm making arrangements to make the change to my 500D, I can not wait!
How many dark! What patience, I usually do it 4 or 5, depends on the shutter speed, but if they are placed by 10 minutes 5 I already seem to many, there are 50 minutes of battery that they go only for photos with the cap!

a greeting
Clear

avatarjunior
sent on January 22, 2012 (18:48) | This comment has been automatically translated (show/hide original)

Hello and thanks for the comment!
You must consider, however, one thing .. The light pollution factor. I shoot without filters against 'IL and a polluted sky average (about ten miles from Prato in the hills). Here you can see a single click img846.imageshack.us/img846/8523/img9288z.jpg. So I had to integrate much more to get more signal on the nebula. Moreover, the image was added nice noisy, despite the dark. So I was able to pull out a little signal (otherwise the noise was king). I gotta say this is a compromise between the signal and the noise.
Then consider that it is the second image that I do with the camera that has been modified recently. So I have to improve in it processes. The signal Halfa I missed :)
For dark for luck when resuming from home I did not notice much in the end I'm the warmth and the remote control remotely. But when I go to the mountain already make a dozen I think so. But in that case you are rewarded by thesky much better.

John

avatarsenior
sent on January 23, 2012 (12:36) | This comment has been automatically translated (show/hide original)

Jpg Thanks John! I get it! ;-) In fact, the light pollution in that pose is monstrous! In general, under dark skies with 4 minutes of exposure and focal ratio that you see just the nebula, but you can take it out much better because you have no light pollution around! Congratulations then to the work of post, not have been easy. At this point, under a good sky, in the same way, you'll see some good! As soon as I send my Rosetta last year, was already on the old forum, an hour of laying in total, but a sky mountain.

Clear

avatarsenior
sent on January 26, 2012 (18:45) | This comment has been automatically translated (show/hide original)

If the problem is the inquinamenro bright, I do not think that increasing the integration is the solution, indeed. I would try with a good filter. The way I see it, in the condition you described, you could not do better.
Congratulations and hello.
Giorgio

avatarjunior
sent on February 02, 2012 (22:07) | This comment has been automatically translated (show/hide original)

Thanks George's comment. In fact, you're right to you, beyond a certain point it is useless to push the exposure if the sky is not good. There is a limit to everything .. :-D What I would have expected from the sum of the poses was a noise abatement more obvious, instead I do not think there was much. Then I repeat, is the second pose I do with the camera changed so hoped to improve a little 'in the development of the next picture .. I was considering buying a filter IDAS light pollution, but I reckon it looks a little 'Having regard to the adverse weather we have in this period ..
Thanks Clare for your comment! Appearance then your version of the rosette!

avatarsenior
sent on February 03, 2012 (10:34) | This comment has been automatically translated (show/hide original)

Here is my Rosetta

Like I said it's just an hour of laying and especially my Canon is not changed (it was not, in these days is "under the knife" for the modification work). On subjects like this filter change radically changes the results, it is much easier in post pull out the nebula without pulling out the noise, provided of course that the sky is pretty dark. In this shot I was on the edge, maybe even a little 'more, because there's enough noise.

hello!

Clear

avatarjunior
sent on February 17, 2012 (15:46) | This comment has been automatically translated (show/hide original)

Well looking at the single-shot almost anything you can not foresee, if this is the result is fantastic!

avatarjunior
sent on February 18, 2012 (0:44) | This comment has been automatically translated (show/hide original)

Hello Wade! Thanks for the comment! Yes, this is the result obtained from the sum of many individual shots.
If you exhaust the single shot that I posted and align the red channel is beginning to see better the nebula. What I posted is the raw direct I get from a single photo, then open with adobe lightroom and converted to jpg for the web.
The technique astrofotografica provides in general the use of many poses that align and calibrate each other, improving considerably the quality and quantity of the weak signal collected with a single click. In short, I try to improve the signal / noise ratio. Of course, as Chiara said pick up a sky with less light pollution in general guarantees me a better result.

avatarjunior
sent on March 01, 2012 (17:32) | This comment has been automatically translated (show/hide original)

sooner or later I'll try it too! :-)
I'm really interested this world ...
Meanwhile, I'm happy to look at jupiter, orion and a few others ... ;-)

user188
avatar
sent on November 12, 2012 (12:40) | This comment has been automatically translated (show/hide original)

After your lesson yesterday at lunch, at least now I understand the comments :) Beautiful shot

avatarjunior
sent on November 14, 2012 (14:38) | This comment has been automatically translated (show/hide original)

Thank you! Yes, I just figured out the general mechanism comes into focus .. ;-)


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