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Pleiades...

Astrofotografia

View gallery (7 photos)

Pleiades sent on December 30, 2012 (13:38) by Manu3287. 7 comments, 1246 views. [retina]

Posa B f/5.6, ISO 800, tripod.

9x148s+1dark+1bias;no flat. SIGMA 135-400 4.5-5.6 APO @400mm su eq3-2 motorizzata in RA. Prima prova in assoluto con la somma di più pose. Mi rendo conto che la messa a fuoco non è perfetta e c'è un po' di aberrazione, ma il problema principale è la post! Con Iris non sono riuscito a cavarne fuori nulla, così mi sono aggiustato con DSS+PS6. Non riesco a tirar fuori la nebulosità dell'ammasso (solo un po' attorno a Merope ma nulla più). Secondo voi 22 minuti sono sufficienti per far risaltare un po' di più le nebulosità? Io immagino di sì e penso dunque che il mio limite sia la post... Attendo vostri suggerimenti...!



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avatarsenior
sent on December 30, 2012 (16:22) | This comment has been automatically translated (show/hide original)

Hello, who are inexperienced to tell you that you made a lavorone, even when not perfectly in focus as you say, I would have done worse. However, I would put more dark, bias and flat and perhaps would have improved slightly maybe just noise. I notice a little burn on the white, maybe the saturation is too high and that is why you find it hard to balance everything. Have you tried to reduce the brightness values ??and then act on the curves? CS6 do not know but I think it's similar to CS4 I have, however, you may repeat the PP pulling less values ??to compare to this, I'm sure that in the end you will find the right balance. Expect however, the comments of the experts. From that I am a beginner and eventually learn too! :-) Happy New Year! Beppe

avatarsenior
sent on December 30, 2012 (18:31) | This comment has been automatically translated (show/hide original)

Nice work as early M45 is always a pleasure to see ... zoom you used does not help you at all ... not easy to make a sharp focus

user15434
avatar
sent on December 31, 2012 (12:45) | This comment has been automatically translated (show/hide original)

Hello Manu,
the picture is very out of focus and chromatic aberration is dominant. Unfortunately not depend on the photographer ;-) and then the only thing you can do is turn a little 'do the diaphragm or three shots with different focus for the red, green and blue (not recommended). Less economical alternative is to change the lens:-D (a good 420 mm 339.00 € on the coast and with a flattener from 115 euro becomes better than any Canon or Nikon on the market).
Post-production is not bad and the result you got is still discreet. The weak point is that you have written yourself no flat . The flat is very important especially for targets like the one you used tu (where there is a strong vignetting).
To bring out the nebulosity ofPleiades and you need a shutter speed longer. With shutter speed do not mean 22 minutes (that is the integration time and does not have much meaning in photographic terms) but the 2 and a half minutes of the single click. That is the time that you determine the signal [1320 poses a second injury 22 minutes of integration, but with a second exposure does not even see the stars of the Pleiades:-D] . In fact if you look at my photo of the Pleiades taken at f/5.6 (so like you) at 800 ISO (ditto) with an exposure time of 6 minutes, you only see a little bit more of your www.astrotrezzi.it/ ? p = 544. Probably you need to put each 10 minutes or more for each pose.
Greetings and see you soon,
David

PS: for post production with IRIS you tried to browse my tutorial? Do you find the iddress www.astrotrezzi.it/docs/guida_iris.pptx. Let me know if you need help! Also remember that, even if not the best, you can do the flat even now! A night of cloudless sky a star tip and make a focus similar to that of the Pleiades, then with the same ISO photographing a white screen of a PC and you're done ;-)

avatarjunior
sent on December 31, 2012 (13:56) | This comment has been automatically translated (show/hide original)

You are great!
For now, this is the only tele I have, but I hope to try another short ... I thought it was good as APO, but apparently I was wrong ...
Astrotrezzi, right from your tutorial I started to use Iris but probably not out anything just because I could not load flat (not having them!) ...
So, last night I tried again: darker (6), more bias (8) and the notorious flat (5) making the screen completely white smartphone front of the lens (20cm). I could incorporate something more thanks to the moon sort a bit 'and then later I did 15 poses but always 148S. Iris finally gave me a little 'satisfaction and below you can see the result:



As you say, 148 seconds are evidently Pochini to bring out the nebulosity, soon I will try to lengthen the time (even in the darkest skies ;-))

In fact, if you look at my photo of the Pleiades taken at f/5.6 (so like you) to ISO 800 (same), with an exposure time of 6 minutes you will only see a little bit more of your www.astrotrezzi.it/? p = 544

This is a little more? Damn, I could pull so well from the deep sky nebula!

In the end, last night I could not resist and I also photographed M31 with the same settings as the image above ... will post soon ...

Thank you ragazzi!
Keep it up!
Happy New Year ...

avatarsenior
sent on December 31, 2012 (15:21) | This comment has been automatically translated (show/hide original)

My comment is the same as that done for M31 is a very good result, considering the equipment. As already highlighted lacks the flat and with a little 'of laying in more results improved. I understand that if you can not drive it hard to increase the poses, I did it too early and not with 400 mm focal length, but with 1200! So never more than 30-40 seconds, max 60 if I could be stationed well.
Keep it up, even if the first results at times discouraged, everything is good to learn!

Greetings!

Clear

avatarjunior
sent on January 06, 2013 (0:21) | This comment has been automatically translated (show/hide original)

Hello
nothing to add to the advice of Clare and David, you do not believe in miracles post, the photo is an astronomical somm of various factors, all to treat maniacally, and even when you put the best of my're not sure of arriving at a worthy result ... welcome to this crazy "universe" which is the astrofoto ;-)
Do not give up you're on your way!

avatarjunior
sent on December 14, 2013 (19:04) | This comment has been automatically translated (show/hide original)

if you like astrophotography to get good results you need to have a fixed focal length camera lens or photograph
the focal length lower.
to photograph with focal more with the zoom, you need to make a precise iris to be put in front of the lens
and with a hole corresponding to the diameter of the rear lens.
a friend of mine has been able to do using the lens barrier aluminum drilled by a turner
in my photo I used the focal length of 55, to go beyond even lead to distortions in the middle (but it is a goal of 150 eu)
compliments, however, given the equipment to a minimum


RCE Foto

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