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  1. Galleries
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  3. Astrophotography
  4. » M42 the Great Nebula of Orion

 
M42 the Great Nebula of Orion...

Deep Sky

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M42 the Great Nebula of Orion sent on April 28, 2013 (17:10) by Bergama. 6 comments, 578 views.

30 sec f/5.0, ISO 400, tripod.


View High Resolution 8.0 MP  

1 person like it: Tristan


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avatarsenior
sent on April 30, 2013 (21:29) | This comment has been automatically translated (show/hide original)

There is something to be reviewed in postproduction. Can you give some more information about your photos? Optics, if they are single shots or more shots, etc ...

hello

Chiara

avatarjunior
sent on April 30, 2013 (23:33) | This comment has been automatically translated (show/hide original)

Hello Clare,

The photos of the so-called deep sky compositions are always more 'shots, I usually snap a dozen photos and their dark frames and then process it all with Astroart and finally filter and I improve the details with Photoshop and other programs.
Using the Canon 350D or 550D applied, without lens, the telescope Bresser N203 F / 5 on EQ6 mount motorized without guiding.
I usually put between 30 and 60 sec. at 400 or 800 ISO.
I hope to be exhaustive, but do not hesitate to contact me for more information.
PS While you are doing astrophotography?

avatarsenior
sent on May 01, 2013 (13:24) | This comment has been automatically translated (show/hide original)

Even you do astrophotography?

Yes, for about a dozen years, I started with film, now I use a modified 500D with Baader. You can take a look at my gallery if you like.

The procedure that uses it seems to me very similar to what I did 3-4 years ago, when I was driving still poses, with the difference that I came to 40-50 individual shots, never higher than 30-40 seconds, because without guide. If you fail to drive (either manually or with guider), and significantly increase the shutter speed you will see that the results will change dramatically, I do not believe it, but when I tried it ...!
As for the post-production is one thing that I noticed in almost all of your pictures is that you tend to keep the bottom very dark sky and contrasts very strong, that make you stars and paryou burned bright (like the nucleus of the comet and M31). For the Orion Nebula in particular, the color seems a bit 'too dirty everything magenta, while in reality there are parties also to the reflection tending to blue. For the central area however the advice is to merge a series of shots with faster shutter down, using a lot of patience with Photoshop layers.

Regards and clear skies (which serve!)

Chiara


avatarjunior
sent on May 01, 2013 (23:12) | This comment has been automatically translated (show/hide original)

Hello Clare,
thanks for the advice, and since you're an expert, I would like to undergo a doubt of mine and that 'the reason why I joined this forum: after 2 years of astrophotography with a 350D to 550D are past, hoping to improve given the 10 megapixel more 'and the live view and instead get images with less grain and signal more' big. Am I mistaking some of the settings in the new machine? I have created a special gallery with photos of both cars equal to 'exposure and the ISO and shooting in JPEG or RAW.
I would be very grateful if you could help me.
See you soon, Alberto.

avatarsenior
sent on May 03, 2013 (21:52) | This comment has been automatically translated (show/hide original)

Well, judging from the photos you posted in the gallery we would say that the game wins the 350D. The photos were all taken on the same night and with the same conditions of the sky? This is important to be able to make a meaningful comparison.
The "grain" to tell the truth I think most end with the 550D, is particularly noticeable when shooting in raw, while the 350D shows the edge lighting on the top left of the sensor, the so-called "amp glow" that is noise thermal type of electronics, eliminated in later models of Canon. And 'boring, but it can be removed with calibration files (dark, flat, etc..). The discourse of "more mega pixels = better pictures" actually in astrophotography is not so obvious. In fact, for the same sensor size, a greater number of pixels signitin g smaller pixels and then actually less capable of collecting light. This difference is not in the picture during the day, but night shots is very noticeable. So a camera with more Mpx shows a higher resolution, but a collection of light lower, and then to obtain the same result should exhibit more. This does not mean that the 550D is "worse" the 350D, only that it must be used in a different way. The highest level cameras this thing is offset by more sophisticated electronic, for no other reason sometimes termed camera bodies that cost 10 times as much! Furthermore the limit in the resolution of astronomical photos is greatly influenced by optical, not only by size but also by the quality of workmanship.

At the moment, since you're still making its way up, I can advise you to keep theto 350D for amateur astronomers, and the 550D for day use. When you're ready to move on to longer exposures can make greater use of more than the 10 megapixel 550D. I do not advise you to go further, because more pixels = bigger files = more difficult to manage by the PC!

I also advise you to turn your question in the forum dedicated to the technique, because maybe here in the forum photo may go unnoticed. Maybe add a text link to the gallery that contains photos of comparison.

A greeting!
Chiara

avatarjunior
sent on May 07, 2013 (6:53) | This comment has been automatically translated (show/hide original)

Thanks a lot, Chiara, your valuable advice, I have done other comparisons to the image sensor (on the same night, of course) and I came to your conclusion too, that 'that with the new 550D I had any more' (the fact of the pixels more 'small' definitely true). Now I'm gearing up with the guider, I hope to do the first tests in the week (sky permitting) even though I have the great unknown of light pollution that from my site on the outskirts of the village and 'quite high.
As soon as I have some decent result maybe I load them into the gallery.
Best regards, Alberto




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