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  4. » The Great Orion Nebula

 
The Great Orion Nebula...

Astrofotografia

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avatarsenior
sent on November 23, 2011 (18:45) | This comment has been automatically translated (show/hide original)

I put hand to shoot that I did last winter, to see if I could pull off something decent. This photo was one of the first made with the refractor 80/480, I had not the chance to do the flat (and you can see the vignetting) and I still had the "courage" to do long exposures. But I was sorry to leave buried in the HD photos and even if you can do so much better I decided to share the same picture, which improved as is always the image of one of the most spectacular objects in the winter sky.

Clear

avatarjunior
sent on November 23, 2011 (22:08) | This comment has been automatically translated (show/hide original)

Hello Chiara, the picture is beautiful, with the area of ??the trapezoid-read ... I would say very balanced. Even better for the fact that you have the patience to drive manually so long as well as assemble and align everything.
Because they are just at the beginning of astrophotography I one thousand questions for you, but for now I limit myself to two.
that ISO uses the 500D and polar alignment you (only polar scope or do even drift Bigourdan?) because I see a lot of stars point to the edge of the field ..
Thank you and congratulations again
Henry

avatarsenior
sent on November 24, 2011 (9:49) | This comment has been automatically translated (show/hide original)

Thanks Henry!
it is true, I have not indicated the ISO! Usually imposed at ISO 800, not so much a question of noise, but because in 1600 you could have a sky background too bright. Polar alignment I only do it with the telescope's polar EQ6, the Bigourdan is much more accurate, but since I've seen that even with the telescope only the results are satisfactory prefer to spend more time on the field at times that all'allinemaneto. The pinpoint stars to the edge of the field I have to admit that I'm on the telescope, which is an astrograph exceptionally, as a little boy.

Skies!

Clear

avatarjunior
sent on November 24, 2011 (19:59) | This comment has been automatically translated (show/hide original)

Clear, the image is remarkable.
I did not understand one thing: Always do a double exposure to not overexpose the core but then the merger do it with photoshop on 2 levels, or leave it all to the appropriate program (type DeepSkyStacker)?

avatarsenior
sent on November 25, 2011 (10:30) | This comment has been automatically translated (show/hide original)

Thanks Fabrizio!
I put together separately poses the same time getting the two images and then join on two levels with PS, using the same procedure that is used for the double exposures of landscapes. The program specifically for astrophotography (use MaxIm DL) use it only for alignment and pre-treatment for the rest prefer PS.

Clear

avatarjunior
sent on November 25, 2011 (18:40) | This comment has been automatically translated (show/hide original)

Thanks Clare for the info ... So ISO 800 on the 500D I would say it very well, although I do not know then how much noise you have to remove later, I'm not having experience, I made a single installation of M42 of 90 seconds with the 40D at ISO 500 (at 200mm f4 with the binacone 2.8) for fear as well as the gray sky also a lot of money, but I must say that the result is quite positive. For guidance I let the hype stationed only with the Losmandy polar scope and the stars are very point though 200 mm are not enough to judge ... the problem I have it in my irregular periodic frame a pose that is not a bust me (You will probably I'll have to clean the gears). Now the other question (please bear with me), I saw that you did put 15 two-minute tours, but they were all good or are the top 15 of a longer series? and then the other question, your rifrattorino has the focal reducer / field flattener or naked? because if he is naked is good but a lot! and also fairly apo.
Thanks again for the availability & agraI; ;-)
Henry

avatarsenior
sent on November 25, 2011 (20:54) | This comment has been automatically translated (show/hide original)

In fact, the noise comes off when you mean (and this is one of the reasons why you do). After I took just a little 'noise selectively from the sky background, because there will inevitably always something escve when you pull on the curves to bring out the more subtle details of the nebula.
With 200mm focal length you can safely do the driving, if the telescope is well based. In fact, to judge the goodness of the chase should try with a focal length greater: me with my mount stationed as I said I came in about 30 seconds guided fine with 1200 mm focal length, 40 already saw the stretch, I had to drive over. If a pose you and you bust is as you say, it may be irregular periodic.
The 15 poses were all good, for goodness sake! Driving in hand is better not to make mistakes, because it means repeating the poses stretch the boredom of driving!
You've got it right! This photo is made with reducer / flattener 0.85 x. It 's already good even naked, But since I use it especially for large objects in the field prefer to use the flattener. It 'sa apochromatic, the goal is a triplet. I must say that I find it really good, especially after having experienced previously with the 80 mm achromatic whose results you can imagine.

Hello!
Clear

avatarjunior
sent on November 25, 2011 (23:02) | This comment has been automatically translated (show/hide original)

as I like these shots,,, astrophotography ... congratulations admire in silence

avatarjunior
sent on November 29, 2011 (13:30) | This comment has been automatically translated (show/hide original)

Gorgeous! Congratulations!
Visible color shades of this beautiful nebula and star point perfectly!
He's rivenendo the desire to pull out of my garage reflector newton ... but where I am now ... fog ... fog ... and ... fog! :-(

avatarsenior
sent on November 29, 2011 (15:00) | This comment has been automatically translated (show/hide original)

Galdor, even where I live there is only fog, in fact, at home I can not do anything. I usually go to the mountains, at least about 1500 meters, if possible even higher.

Clear

avatarjunior
sent on November 29, 2011 (16:44) | This comment has been automatically translated (show/hide original)

Look, would very much like to me, but when you have a family and a little girl you find it difficult to do everything.
I now can not find the time to do anything.
However, in Mantua are maybe 2 or 3 weeks you do not see the sun and in the summer you eat the mosquitoes! You know precise guidance I can do? :-D
Definitely see your beautiful pictures brings me more and more want to pull out the equipment dated (I have it by the passage of Halley ...:-D), if only for observation. I spent whole nights in the cold to look at all possible!
Meanwhile I enjoy the sight of your beautiful photos!

Stefano

avatarsupporter
sent on December 02, 2011 (22:26) | This comment has been automatically translated (show/hide original)

And far this beautiful place? .......... But how small we are?
Hello. Maximum

avatarjunior
sent on December 03, 2011 (10:35) | This comment has been automatically translated (show/hide original)

1500 years-light ... more step up less ... after all relatively close
Hello
Henry

avatarjunior
sent on December 07, 2011 (12:32) | This comment has been automatically translated (show/hide original)

Who tells me what's the flattener reducer?

avatarjunior
sent on December 07, 2011 (18:28) | This comment has been automatically translated (show/hide original)

The astronomical instruments were born to a visual use generally have a spherical focal surface unlike the traditional photographic lenses that have it flat. to take pictures you have to apply the flattening of the field that contains the focal surface on a plane so that both the stars at the center of the frame that the edges are perfectly in focus. the focal reducer is used to shorten the focal length of the telescope and to increase the brightness of the photographic usually natively is pretty low, all for lower shutter speeds that are notoraimente lunghini. reducer and flattener are usually combined into a single optical unit that is at the telescope before the camera.
The telescopes were born for photographic use (astrographs) already have the flattener built in optical design, while it is possible to apply the focal reducer externally.
I hope I have clarified your doubts ..
hello
Henry

avatarjunior
sent on December 07, 2011 (19:24) | This comment has been automatically translated (show/hide original)

Thanks Wolf in practice solve the distortion.

avatarjunior
sent on February 17, 2012 (15:59) | This comment has been automatically translated (show/hide original)

beautiful!

avatarjunior
sent on March 12, 2012 (22:20) | This comment has been automatically translated (show/hide original)


avatarjunior
sent on April 03, 2012 (19:12) | This comment has been automatically translated (show/hide original)

Hello Chiara. Many compliments for the beautiful pictures. Orion is and will always be great. It 's really nice picture and very well led. And then a lot of attention to detail. Congratulations again, even given the fact that you are very young but experienced on all fronts. I have the nostalgia of driving manual and analog astrofoto of which 10 years ago I had the experience. I'm starting. And I wanted to ask, the sensor has changed the filter, right? Excerpts from the core? When you say you mean the sum of the average (median) of pictures of the same duration with added sw dedicated. Then walk to Ps, the chief 2 photos to bring out detail. Mainly with what functions? From that site you photographed? There was a good or mediocre seeing? And finally you have the Pronto Televue?
Sorry for all the questions and still BRAVA.
giorgio

avatarsenior
sent on April 03, 2012 (22:04) | This comment has been automatically translated (show/hide original)

Hello George, thanks for the comments! And also to the "very young"! ;-) In fact, right living quarters are not for Astrophotography is a lot 'practice (I was 17 and I started with the legendary Hale-Bopp and Kodak E200!).
So: my camera at the time of this photo, had no dedicated filter, I did make only recently replaced with the Baader filter and I have to say it is really another life (you can see the Flame-Horsehead in my tunnel, with the original filter that red forgot me!). When I say average I mean the arithmetic average of the poses of the same duration. In fact, the algorithm I use is just an average, but something like that, which excludes from the calculation of extreme values ??(which may be, for example, data from the passage of a satellite, or cosmic rays, etc..) For simplicity, let's call it anyway " media. " The program I use (Maxim DL) is able to directly read the raw, allows fine alignment of the poses, the calibration byrk and flat, the "average" (or other dialing options more shots) and other functions that generally do not use, because after obtaining the calibrated image step in PS. This Orion Nebula I used two sets of pictures: 15 clicks from 2 minutes to 30 seconds and 15 shots for the nucleus. With MaxIm I got two separate images which I then put together with PS using the technique of overlap of levels, so that the image of the nucleus with the poses from 30s trasparisse below the saturated zone of the pose from 2 min. To pull off then the other details I played a little 'over curves and levels, in order to obtain a sufficiently dark sky background without darkening too much rest and pull out without too much noise. The site for the filming of these shots is a location in the Susa Valley, the mountains of the municipality of Condove. Seeing there is always average, because in Val Susa is no wind, but does not detract much the photos taken with a focal length not too long, like this. My telescope is not ready, but the triplet apo with elementsto the fluorite Tecnosky, 80 mm in diameter and 480 focal length, that reduce field with a Boarder / gearbox from 0.8 x. No problem with the questions, if you need to send me a message in private as well.

hello!
Clear


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