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  1. Galleries
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  3. Astrophotography
  4. » Pleiades Star Cluster

 
Pleiades Star Cluster...

Astrofotografia - Deep Sky

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Pleiades Star Cluster sent on October 23, 2015 (17:38) by Fdicencio. 24 comments, 1850 views.

Ripresa in quadricromia con CCD Qhy9 raffreddata a -20° e filtri Baader, Telescopio rifrattore TS 102 APO FlatField con riduttore/spianatore Riccardi, Montatura Celestron CGE, Esposizione totale 4,9 ore


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avatarsenior
sent on October 23, 2015 (19:06) | This comment has been automatically translated (show/hide original)

Superb!

avatarjunior
sent on October 23, 2015 (21:18) | This comment has been automatically translated (show/hide original)

Thank you ;-)

avatarjunior
sent on October 24, 2015 (7:35) | This comment has been automatically translated (show/hide original)

Compliments !! Spectacular !!

avatarsenior
sent on October 24, 2015 (8:21) | This comment has been automatically translated (show/hide original)

Wow !! An incredible delicacy, like poetry! Compliments!!
Marzio

avatarsupporter
sent on October 24, 2015 (8:34) | This comment has been automatically translated (show/hide original)

Spectacular! Bravissimo, hello

avatarjunior
sent on October 24, 2015 (14:01) | This comment has been automatically translated (show/hide original)

beautiful, congratulations!

avatarjunior
sent on October 24, 2015 (14:15) | This comment has been automatically translated (show/hide original)

Thanks guys -D ;-)

avatarjunior
sent on October 24, 2015 (14:44) | This comment has been automatically translated (show/hide original)

But how beautiful it is, damn it!

avatarsenior
sent on October 24, 2015 (18:46) | This comment has been automatically translated (show/hide original)

Show

avatarjunior
sent on October 25, 2015 (20:37) | This comment has been automatically translated (show/hide original)

Thank you guys ;-)

avatarsenior
sent on October 26, 2015 (7:37) | This comment has been automatically translated (show/hide original)

Gorgeous!! Compliments

avatarsenior
sent on October 26, 2015 (9:19) | This comment has been automatically translated (show/hide original)

hello, I really like, just do not like the effects on the stars, I find them a bit invadenti.Cio remains that the picture is spectacular and I'd clicked down time to see how you make these shots
Hello and congratulations again

avatarjunior
sent on October 26, 2015 (10:10) | This comment has been automatically translated (show/hide original)

Hello,
thank you ... is this the spikes (the cross on the bright stars) are set off software was being taken with a refractor that does not have a secondary and therefore did not support the cruise that generate spikes of course (as in shooting that see done with the RC).
Personally, I particularly like the spikes and then I tend to put them even when shooting with refractor ... in this particular one I put them in part to counter the real spikes you see "vertical" and small that are given by the microlenses of the sensor and CCD which unfortunately are particularly evident on occasions to short focal length and focal "open" (this was about f / 5.2).
However, keep in mind that as regards the length of the spikes if they were "natural" would be very similar to these because of the brightness; the stars in question ... to realize it just see that those made with the RC and in particular Merope which is also present in this but there shooting a 2 m focal length.

The realization of astronomical images long exposure however is something a bit 'special as you shoot many images, already with their individual poses of 5-10 or even 15 minutes and more), are calibrated with dark frames and flat frame for remove noise "fixed" and "flatten" the image (and to remove the dust particles) and then is "sum" together with special software in order to significantly improve the signal / noise ratio and thus make workable post the image in order to extract all of the ones that's in it without drowning in all the noise or createartifacts.
Please take into account that the phase of the post of an image astronomical requires a shift from a state of linearity of the signal to one of nonlinearity .... essentially each image of this type is a HDR because the brightness of the various components is extremely unbalanced. Even with some people who have some parts are very bright (see the Orion Nebula and the Andromeda galaxy) will make its various exposures to the brightness and for those weak for returning them to the post (a big job I assure you: - D).
Anyway here: www.astrobin.com/full/1236/0/ find an example (right on Andromeda) of a recovery in the course of work ... where the graph below represents the trend of driving carried out one star with another room shooting.
<br />
Hello and thanks,
Francis


avatarsenior
sent on October 26, 2015 (11:35) | This comment has been automatically translated (show/hide original)

Francis, thanks to the explanations on the photo is that the technique to use. I have not actually even tried using my little astroinseguitore for photos of this type. Considering also that on my vixen polarie I upload max 2-2,5kg I can not put on much. Definitely I try with a 135-150mm but I suppose I can not take much.
Thanks again.


avatarjunior
sent on October 26, 2015 (12:02) | This comment has been automatically translated (show/hide original)

Hello,
then with a astroinseguitore, if done well, you can shoot with lenses up to 200mm maximum ... but broad field with a 135 mm can do great things ... if the goal is done well enough and paved (perhaps a closing bit 'the diaphragm) ... and then you have to see when you can push with the individual poses ...

A fantastic goal to take pictures off the field is the Leica apo telyt 180 ... looking photos of Alexander Falesiedi and look what we got out;)

This was done with a cooled monochrome CCD sensor with the use of the filters a bit 'smaller than a canon aps-c and with a focal length of about 530 mm and a total weight of almost 10 kg ... here you need to force an equatorial mount ...

Hello,
<br /> Francis

avatarsenior
sent on October 26, 2015 (13:58) | This comment has been automatically translated (show/hide original)

I can use a 135 2.8 canon wide open though as on modern lenses can not control the diaphragm (at Fuji).
The alternative is to use an old 135 2.5fd. But before you spend a few Euros I would understand the performance with a lens like that. Above all, what to shoot first?
Thank you and sorry if disponibiltà inquindo the 3d.

avatarjunior
sent on October 26, 2015 (15:13) | This comment has been automatically translated (show/hide original)

no problem ... quiet;)
normally even the best goals are not entirely suitable for photographing the sky wide open because, above all, not stellar puntiformità the edges. The Canon 200 f / 2.8 as good or 70/200 must be closed for one / two stops ... in this, I am told, the Leica still be better than the others also both closed at f / 4-4.5 .. .
However, if you, too, a canon (any) can close the iris and then take off the lens with the machine switched on (bother me thinking .. but tell me functions and does not cause problems -D) to keep the iris closed.

however it is not your fuji modified to display good red nebulae (that it will see much less of a room changed) the ideal subjects are those that emit full spectrum then galaxies(Large .. like Andromeda) and open clusters ... how precisely the Pleiades or the double cluster (although this is still very small and inconspicuous these focal) .... or whole constellations perhaps with elements landscape;)

avatarsenior
sent on October 26, 2015 (15:24) | This comment has been automatically translated (show/hide original)

I do first: where do you live ?? -D: -D: -D
Maybe we go together me two straight, or you call in Abruzzo to campoimperatore, source vetica etc. and we take them together !!

avatarjunior
sent on October 26, 2015 (15:29) | This comment has been automatically translated (show/hide original)

maybe ... but I'm a little 'distant mountains ... but always Dolomites: -D

look at that over there ... or neighbors but they are of good people as much as you want;)

avatarsupporter
sent on October 26, 2015 (15:30) | This comment has been automatically translated (show/hide original)

WONDERFUL! Wow !! Wow !!
The stars shine even in the picture! ;-) :-P


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