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  4. » The Pleiades: the blue depths of the sky

 
The Pleiades: the blue depths of the sky...

Astrofotografia

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user8331
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sent on October 24, 2012 (21:57) | This comment has been automatically translated (show/hide original)

I always read the descriptions of these fantastic shots but do not understand anything:-D

Anyway, congratulations, I guess shots are not easy

Stefano

user15434
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sent on October 24, 2012 (22:07) | This comment has been automatically translated (show/hide original)

Congratulations! Have you noticed the galassietta bottom right wow!? It makes me crazy ...
See you soon,
David

avatarsenior
sent on October 24, 2012 (22:09) | This comment has been automatically translated (show/hide original)

Chiara excellent! :-) Just the other day I was "getting over" the equipment (in the sense that I bought a little at a time ;-)) and I'm finally ready to enter the world of night:-D I was going to do it right with the Pleiades 8-)

very clean, natural and beautiful sky background neutral, congratulations :-)

avatarsupporter
sent on October 24, 2012 (22:47) | This comment has been automatically translated (show/hide original)

Clear the picture is excellent :-) but please remove the string from the refractor :-(

avatarsenior
sent on October 24, 2012 (23:10) | This comment has been automatically translated (show/hide original)

Beautiful photos.

user16120
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sent on October 25, 2012 (7:45) | This comment has been automatically translated (show/hide original)

Chiara good, very beautiful!

avatarsenior
sent on October 25, 2012 (20:58) | This comment has been automatically translated (show/hide original)

Thank you all!

@ Steven90: Well, the descriptions are a little 'techniques, because they are also synthetic. In this case, I brought the telescope used, the camera (with Baader filter, ie a filter specifically for astronomy), the tracking system (Equatorial Mount with the motion time and manual correction of inaccuracies made in pursuit of a telescope parallel to that of shooting with an eyepiece which gave 114 magnifications), the exposure time (60 minutes divided into 12 individual shots from 5 minutes) and the use of dark frames, that is, the image of laying equal to those of recovery ( 5 minutes) that is subtracted to eliminate noise.

@ David: I do not see galassietta you say, I have not found even on the map of the Pleiades nell'Uranometria. Maybe there is some double star stretta may seem the core of a galaxy?

@ Dexter: good luck for your first test! The Pleiades are a good person to start with, because they always give satisfaction, however they are.

@ Canopus: why not the string? I do not mind the spikes, especially in photos like these with very bright stars. In some cases are necessary, as the Flame Nebula in Orion: the only way to reduce the exuberance of the nearby Zeta Orionis is a little scatter 'of its light by diffraction, so that the spikes are oriented not on the nebula. But I do not always use them, where there are no very bright stars usually do not.

Hello and good evening!

Clear



user15434
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sent on October 25, 2012 (22:17) | This comment has been automatically translated (show/hide original)

Hello Clare,
the galaxy PGC 13696 and is located at the bottom right of the star Electra. I am attaching a crop of my image of the Pleiades:



The tender galassietta can also be seen in your wow!
Ciaux and see you soon,
David

avatarsenior
sent on October 26, 2012 (10:01) | This comment has been automatically translated (show/hide original)

The tender galassietta can also be seen in your


Be! it's true! I had not noticed mica! Sometimes control in catalogs, nell'Uranometria perhaps this is not shown because it is very small. Nice, I wonder if it is inhabited ;-)

hello

Clear

user15434
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sent on October 26, 2012 (11:00) | This comment has been automatically translated (show/hide original)

Hello Clare,
you ... is very tender! In any case, now that we get incredible magnitudes with DSLR and CCD, the Uranometria is not the best to search for objects :-(.
I suggest instead the website server1.wikisky.org/. E 'on-line but I think it's the best way to detect very weak as PGC 13696 ;-).
See you soon,
David

avatarsupporter
sent on October 26, 2012 (14:50) | This comment has been automatically translated (show/hide original)

Kiara just because and artificial .. with the apo should contain the "exuberance stellar" :-)

avatarsenior
sent on October 26, 2012 (15:06) | This comment has been automatically translated (show/hide original)

just because, artificial


I do not find artificial, it is an optical illusion real. This is definitely when the spikes are added via software, that is. Put the string through the lens of refractor same as when you take pictures by putting the filters in front of the camera lens. Among other things, there are also real cross-star filter, perhaps now less used just because it's easy to recreate the effect by software.

The apo refractor does not solve the problem of reducing the saturation stellar stars very bright, solves "only" the problem of chromatic aberration, avoiding the "donuts" blue and magenta around stars and the expansion of stellar diameters is given in the spotlight obstruction (and for all telescopes depends on the comunuqe seeing). A very bright star, however, tend to disturb what is around, even shooting with the apo, then I think the system dissipate in the light with diffraction effects is not wrong. Sometimes it is also used in the recovery of close double stars, to "remove" the halo of light shining from a primary area where there is the secondary. Even to do this there are those who build masks triangular, square, hexagonal, etc., to achieve various degrees of diffraction. Without the practical aspect I also like, so I think I will use them again, especially for areas with very bright stars.


David, interesting site. In fact, the Uranometria is becoming obsolete pgrazie to new technologies at our disposal for astrophotographers. But it is still useful forvisual ago, my husband uses it a lot.

a greeting

Clear

avatarsenior
sent on October 26, 2012 (17:45) | This comment has been automatically translated (show/hide original)

Spectacular image! Now you just missing the automatic driving and then you ... arrived! :-D

Two bits of advice:
- Verify that the two strings are at 90 °, so they are really weird!
- Croppa because it is not well centered

avatarjunior
sent on October 26, 2012 (18:11) | This comment has been automatically translated (show/hide original)

Congratulations Clare!
Really Nice!
Hello
Max

avatarsenior
sent on October 26, 2012 (19:45) | This comment has been automatically translated (show/hide original)

Now you just missing the automatic driving


"Only" ;-)

for the position of the string, you referring to 90 ° between them or at 90 ° with respect to the side of the sensor? Maybe they are not perfectly perpendicular to each other, but to be honest the thing that stands out most and are oriented with the sensor, or that they are at an angle a bit 'random, maybe we were better at 45 ° . Next time I'll do a test shot and orienterò better string, the hood can be rotated and not a difficult task to do.

The photo is already a bit 'cropped because it was one of the first I did and did not yet have flat, you could see a nice lighter stripe at the bottom. I did not want to cuttoo, but a little 'crop to re-center you can do of course, thanks for the advice.

May at this point it is clear that mean belittling, with Pleidi we can not settle in one! I want to pose a much deeper, allowing guide:-D

hello

Clear

avatarsenior
sent on October 26, 2012 (20:12) | This comment has been automatically translated (show/hide original)

for the position of the string, you referring to 90 ° between them or at 90 ° with respect to the side of the sensor?

I was referring to 90 ° between them. Turning to the sides is less critical and is left to the taste of everyone.

Until next time!

user15434
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sent on October 26, 2012 (20:54) | This comment has been automatically translated (show/hide original)

already Chiara ... in visual nothing is changed, and then for the visualisti Uranometria is still a reference book.
Congratulations again for the photo. I personally love the spikes (both of Newton and those made by the method of strings)!
Do you think that in the analog era, as you yourself have said, I used the filter star ... a show.
a greeting and eye for the next shot to satellites ;-) (you can see in the photo published ...)
David

avatarsenior
sent on October 26, 2012 (20:56) | This comment has been automatically translated (show/hide original)

Hello Clare, beautiful image! Maybe the sky background is a bit dark but as always personal opinion, everything else perfect!

avatarjunior
sent on October 26, 2012 (21:43) | This comment has been automatically translated (show/hide original)

very nice
is an area I do not know but the photos
are very attractive, like the sky at night
on the other hand.

ps: view your phobia I remove the spider from my galleries

compliments Gilberto

avatarsenior
sent on October 27, 2012 (16:15) | This comment has been automatically translated (show/hide original)

always beautiful "sisters"


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