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  1. Galleries
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  3. Astrophotography
  4. » Andromeda

 
Andromeda...

Astrofotografia

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Andromeda sent on October 14, 2017 (13:12) by Kiril. 25 comments, 1578 views. [retina]

prime foto astronomiche gradite critiche e consigli heq5 fuji xe2s obb. Sigma 400-5,6 apo unione tre pose 2 minuti iso 3200


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3 persons like it: Alexey, Fabioviti, Giacota


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avatarjunior
sent on October 14, 2017 (14:19) | This comment has been automatically translated (show/hide original)

Giovanni finally photos of ...... night ;-)

avatarsenior
sent on October 16, 2017 (16:42) | This comment has been automatically translated (show/hide original)

The shot is definitely improved ..... good as a start .... I think this shot has adversely affected an unsuccessful pursuit.
I do not know if it depends on an incorrect polar station or by a poorly guided guide .... Certainly with a 400mm (600mm equivalent) focus and tracking focus must necessarily be very accurate.
In my opinion you dared too much with the sensitivity .... but do not take what I say as gold cast, there are more experienced users of me in digital astroimaging .... I stopped in the film for this kind of shots!
As a first attempt you still got an encouraging result ... for the improvements there is time!

user44198
avatar
sent on October 16, 2017 (23:33)


This comment is too long to be automatically translated, so it will be shown in its original language (Italian)  

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ciao Kiril,innanzi tutto bravo per provare ad immortalare il cielo e tutte le sue grandi cose che nasconde all'occhio senza una strumentazione adeguata,continua il cielo ci chiama!!
per quel che riguarda la tua foto inizio con il dirti di non camminare vicino al treppiede mentre la fotocamera riprende il cielo!! ti dico questo perché la forma delle stelle dice questo ;-) anch'io all'inizio mi muovevo vicino al telescopio mentre facevo le foto e le stelle avevano la stessa forma!! poi curerei bene la messa a fuoco,per il resto con solo 6 minuti totali di esposizione non si può pretendere altro,ma ti debbo raccomandare di abbassare la sensibilità,a 800 iso è più che sufficiente,intanto le stelle non si espandono come con i 3200 iso in più conservano un pò di colore senza correre il rischio di renderle tutte monocromatiche...
per il futuro inserisci più dati affinché ti si possa dare più consigli mirati ;-),per esempio il tipo di montatura usata con cosa elabori,insomma più informazioni.
Cerca di non demoralizzarti se all'inizio i risultati stentano ad arrivare,questa è una passione dove la pazienza e la costanza giocano un ruolo preminente per il prosieguo Cool
un saluto
Riccardo


avatarsenior
sent on October 17, 2017 (8:54)


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Ecco vedi....un consiglio da un esperto come Vega mette in luce possibili difetti che non potrebbero venire in mente a tutti. Non avevo pensato al fatto che camminare intorno agli strumenti potesse indurre vibrazioni tali da peggiorare lo scatto. In effetti a pensarci bene è verissimo! Tanto per farti un esempio, utilizzando il mio telescopio per osservazioni, dal terrazzo di casa, anche il semplice spostamento d'aria di una macchina che passa sotto la strada a certi ingrandimenti fa oscillare talmente tanto lo strumento da far uscire il soggetto osservato dal campo visuale dell'oculare (questo si verifica a circa 500 ingrandimenti...ma l'effetto sarebbe comunque deleterio anche in fotografie con focali come quella da te utilizzata). Ora....va anche detto che la montatura di cui dispongo io non è proprio solidissima, trattandosi di una montatura a forcella ma, bisogna capire che questo tipo di lavori richiede tantissima attenzione e pazienza.
Perciò avanti e non ti scoraggiare.


user44198
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sent on October 17, 2017 (9:44) | This comment has been automatically translated (show/hide original)

:-D :-D hello Fabio, field experience counts more than hypothetical theories .... if you told me all the combined magents at the beginning of the adventure we would write for a whole day, so we recognize the effects of these inconveniences on the fly without going to investigate beyond ;-) ;-)

avatarsenior
sent on October 17, 2017 (13:17) | This comment has been automatically translated (show/hide original)

AHahahahahah .... the field experiences are a gym for the muscles and the mind.
I remember one night trying to keep the telescopes with a group of friends .... as soon as we were close to perfection it was raining, we do not know where from then .... the sky was almost completely mauled except for the famous cloud fantoziana. At that ..... telescopes flipped in bauliera (with the risk of doing great damage) ... two minutes and again the skies sky and so on for 5/6 consecutive times .... in the end we put take pictures of the lightning they saw on the horizon ... far away ... The sky above us was mahogany but you want the time, you want the anger, we stopped trying.

user44198
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sent on October 17, 2017 (13:33) | This comment has been automatically translated (show/hide original)

and I believe you .... :-D :-D :-D

avatarjunior
sent on October 19, 2017 (13:42) | This comment has been automatically translated (show/hide original)

Thank you all for the valuable advice. I will try to put them into practice. The frame is a HEQ5 used without a guide. For the shape of the stars it seemed to me that there was some coma caused by the focal gear reducer to bring the lens to the actual 400 mm focal plane. Maybe I had to close the diaphragm of a couple of stops. Thanks again for the advice.

avatarsenior
sent on October 19, 2017 (16:31) | This comment has been automatically translated (show/hide original)

Coma is an optical defect that appears cassock to the edges of the image and develops "tail" radically with respect to the center of the image. Here, however, "tail" has the same direction throughout the frame .... a sign of a tracking error or vibration or poor stability ... as described by Vega.

avatarjunior
sent on October 19, 2017 (18:05) | This comment has been automatically translated (show/hide original)

I checked the frame and found the polar telescope not perfectly aligned. Could it have caused an inappropriate mount of the frame, with the consequences on the stars?

avatarsenior
sent on October 19, 2017 (18:46)


This comment is too long to be automatically translated, so it will be shown in its original language (Italian)  

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immagine non puntiforme....potrebbe essere quello la causa o concausa di una immagine stellare come quella da te ottenuta in questa immagine. In questo genere di fotografia tutto deve essere perfetto e perfettamente regolato. A causa delle lunghe focali in gioco infatti, ogni piccolo scostamento dalla "perfezione", ha effetti sempre più visibili man mano che aumentiamo la focale.
La tua montatura è motorizzata anche se non utilizzi inseguimenti automatizzati?
lo chiedo perchè per minimizzare eventuali errori di inseguimento, se fai correzioni in manuale, dovresti usare un'ottica parallela con ingrandimenti molto più forti di quelli indotti dall'ottica con cui effettui lo scatto.
Per farti un esempio....se guardi la mia galleria... trovi un'immagine fatta nel campo della Via Lattea sulle costellazioni di Cigno e Lira. Per fare quella foto ho usato un tempo di posa di 15 minuti (su pellicola ma questo poco importa) e la configurazione era la seguente: apparato di ripresa composto da corpo macchina + obiettivo 50mm f1,7 a tutta apertura montato su telescopio (utilizzato come guida visuale) meade 2120 (2500 mm di focale) con oculare da 9 mm con reticolo illuminato (280 ingrandimenti circa, che andrebbero bene, probabilmente, anche per fotografare con un ottica da 500 mm montata su corpo macchina).
Il telescopio da me utilizzato ha motori su entrambi gli assi comandati da pulsantiera e non automatizzati con autoguida. Le pose hanno bisogno di correzioni costanti per tutta la durata dello scatto (tante più quanto meno preciso è lo stazionamento). In pratica bisogna stare con l'occhio fisso all'oculare e correggere la posizione non appena ci si accorge di uno scostamento della stella guida dal centro del reticolo. Le correzione vanno fatte con la pulsantiera e non con le manopole...altrimenti si rischia di innescare vibrazioni dannose per la fotografia.


user44198
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sent on October 19, 2017 (19:04) | This comment has been automatically translated (show/hide original)

but why go looking for the causes where I am not ?? the stars of that shape on the whole frame imply VIBRAZIONI and nothing else .... mistakes due to a bad alignment affects the long poses causing a nice rotation of the field that has nothing to do with what happened to you ...

avatarjunior
sent on October 19, 2017 (23:22) | This comment has been automatically translated (show/hide original)

The frame is HEQ5 with SYNSCAN. I used only frame timing tracking without manual corrections, with the camera in parallel to a skywatcher of 70-500. It is likely that I accidentally touched the telescope during the photo.

user44198
avatar
sent on October 19, 2017 (23:51) | This comment has been automatically translated (show/hide original)

precisely, that is a way of causing annoying vibrations, what I ask you is, where do you put it while shooting?

avatarsenior
sent on October 20, 2017 (16:22) | This comment has been automatically translated (show/hide original)

I'm going to look for the causes where I'm not going to invoke your advice Vega ... :-D

avatarjunior
sent on October 20, 2017 (17:09) | This comment has been automatically translated (show/hide original)

I have considered your observations and going for exclusion, I think I have identified the leaders of the shape and size of the stars.
As you may have already understood, I come from film photography.
But some habits do not agree with astrophysics.
the first mistake I used was the mechanical flexible cable to start the photo;
Perhaps it is best to use only the electronic shutter off the mechanical one;
Another factor, which I think has influenced the size of the stars, may have been slightly forced processing.
Of the programs devoted to photography, I used only stackers and photo-processing programs for corel or photoshop.
Usually the frame is resting on a solid cement base in the garden, looseno big cities.

avatarsenior
sent on October 20, 2017 (18:27) | This comment has been automatically translated (show/hide original)

You can also use the flexible click to start the photo ... but with the cautious use of the "cardboard technique".
In practice, put a black card in front of the shooting target, having the tendency to hold it without touching anything, click ... wait a few seconds for the vibrations to be absorbed and removed (always be careful not to scrape from any part during these operations).

avatarjunior
sent on October 20, 2017 (19:00) | This comment has been automatically translated (show/hide original)

I was thinking of using the cardboard technique, but I think it's safer to use the remote control, the risk of unwanted vibrations and lurking.
for me the field of astronomical photography and the beginning and represents a new challenge.
I hope to learn from your mistakes and your advice thanks.

avatarjunior
sent on October 20, 2017 (19:11) | This comment has been automatically translated (show/hide original)

:-D Kiril ..... you come. .... let's go ...... together. The desire :-D :-D

avatarjunior
sent on October 20, 2017 (19:12) | This comment has been automatically translated (show/hide original)

A greeting ;-)


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