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  1. Galleries
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  4. » Sun in H-alpha of 12/01/2022 (detail)

 
Sun in H-alpha of 12/01/2022 (detail)...

Sole in H alpha

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Sun in H-alpha of 12/01/2022 (detail) sent on January 20, 2022 (11:09) by Daniele Bonfiglio. 107 comments, 9703 views.  [editors pick]

1/125 f/16.0, ISO 400, tripod. Montagnana, Italy.

Fotocamera al fuoco diretto di un telescopio DayStar Solar Scout 60/930. Stacking di 500 migliori foto su 1200 con Planetary System Stacker. Elaborazione finale con PS, incluso l'inversione della luminanza sulla parte interna al disco solare.



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avatarsenior
sent on February 09, 2022 (7:49) | This comment has been automatically translated (show/hide original)

... I would be curious to know, in a very synthetic way, how to get such an image ...


avatarjunior
sent on February 09, 2022 (10:00)


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

Click here to translate the comment in English [en]


Buongiorno a tutti,
grazie ancora dei vostri messaggi, soprattutto agli amici Fabio e Serafino per il loro continuo supporto!
Visto che mi chiedete qualche dettaglio di come si ottengono questo tipo di foto, vi condivido alcune immagini:
- La mia strumentazione dove si vede anche l'immagine del sole sul display della fotocamera. Il sole appare rosso perché il telescopio ha un filtro interferenziale per selezionare solo la lunghezza d'onda dell'idrogeno che appunto è nel rosso. Questa lunghezza d'onda è quella a cui emette il plasma di idrogeno nella cromosfera, la regione più rarefatta ma anche più calda sopra la fotosfera. photos.app.goo.gl/StfUpPyCEgbTmiu26
- Un esempio di singolo jpeg in bianco e nero come preso direttamente dalla fotocamera. photos.app.goo.gl/9DGFiUkcj4LyqCZKA
- La somma di 500 migliori jpeg su 1200 presi nell'arco di 3 minuti. Tale somma è fatta con un software dedicato e permette di ridurre l'effetto della turbolenza atmosferica terrestre. photos.app.goo.gl/upEdnRtHNDsTj8Lp7
- Il risultato dello sharpening del file precedente, sempre usando software dedicati. photos.app.goo.gl/KyPsZwp7X2Q7RHtg7
- Finalmente l'elaborazione finale con Photoshop da cui ho tratto il crop che è stato selezionato come EP. photos.app.goo.gl/H2Bpfa8mFFHicCU79
Spero di avervi dato un'idea del lavoro che c'è dietro a queste foto!
Ciao, Daniele


avatarsupporter
sent on February 09, 2022 (13:56) | This comment has been automatically translated (show/hide original)

I have no words, a huge job of sure
satisfactionApplausi

avatarsenior
sent on February 10, 2022 (0:41) | This comment has been automatically translated (show/hide original)

The sun appears red because the telescope has an interference filter to select only the wavelength of hydrogen that is in the red

Excuse my ignorance, but the interference filter you mention also serves to attenuate the very strong sunlight that could ruin the sensor?

avatarsenior
sent on February 10, 2022 (0:49) | This comment has been automatically translated (show/hide original)

An example of a single black and white jpeg

but is the exposure of the single frame the same? if so, is it the one shown on in the exposure data?
,,,, why b&w, where does the yellow color come from?

avatarsenior
sent on February 10, 2022 (0:59) | This comment has been automatically translated (show/hide original)

The sum of 500 best jpegs out of 1200 taken within 3 minutes.

How do you shoot a frame every 0.15 sec, will it all be motorized?

avatarsenior
sent on February 10, 2022 (1:06) | This comment has been automatically translated (show/hide original)

I hope I have given you an idea of the work behind these photos

Yes very kind, thank you!

avatarjunior
sent on February 11, 2022 (10:11) | This comment has been automatically translated (show/hide original)

very nice, I still see some noise and sharpness that can be increased. have you tried using the photoshop plug-in topaz AI denoise? it works wonders and in my opinion it improves it further

avatarjunior
sent on February 11, 2022 (10:32) | This comment has been automatically translated (show/hide original)

Good morning Mario, to answer your questions:
1) yes, only the light of the selected wavelength reaches the sensor and this significantly reduces the light that reaches the
sensor2) yes the exposure is the one shown in the data of the photo. As I said the real color of the image in H-alpha would be a vermilion red, but since this is not very beautiful visually usually either you keep the image in black and white, or you color it with a color on the most pleasant yellow (thus making it in false colors). Here I had also made the blue sky which of course is a poetic
license3) yes it is all motorized, I control both the frame and the camera with an app on mobile 8-)
4) please!

avatarjunior
sent on February 11, 2022 (10:37)


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

Click here to translate the comment in English [en]


" molto bella, vedo ancora un pò di rumore e nitidezza che può essere incrementatata. hai provato a usare il plug in di photoshop topaz AI denoise? fa miracoli e secondo me la migliora ulteriormente"
Buongiorno Crazyforlights, sì l'aspetto del rumore è un aspetto essenziale, perché il rumore viene amplificato dal processo di sharpening della foto che è molto significativo (come si vede guardando le immagini che avevo linkato poco sopra). Il fatto di sommare molti frames è legato anche a questo: si vuole abbattere il più possibile il rumore, che diminuirà come la radice quadrata del numero di frames sommati. Per questo è importante cercare di aumentare il più possibile il frame rate cosa su cui sto ancora lavorando. Qui ho già fatto una riduzione rumore importante con photoshop (usando il filtro standard di photoshop). Non ho mai provato quello di Topaz, potrei provare in effetti scaricandomi la versione demo.
Ciao, Daniele


avatarjunior
sent on February 11, 2022 (14:41) | This comment has been automatically translated (show/hide original)

It proves miracles...

avatarjunior
sent on February 12, 2022 (10:00) | This comment has been automatically translated (show/hide original)

Daniele, in Photoshop, in addition to the standard noise reduction filter you also have one available in Camera Raw very effective. If you didn't get the chance, try it ;-)

avatarsenior
sent on February 13, 2022 (18:21) | This comment has been automatically translated (show/hide original)

but since this is not very beautiful visually usually either you keep the image in black and white, or you color it a color on the most pleasant yellow (thus making it in false colors).

but does this happen only for the sun or for all astrophotography photos?
Here I had also made the blue sky which of course is a poetic license

you are an artist though!

avatarsenior
sent on February 13, 2022 (18:25) | This comment has been automatically translated (show/hide original)

in addition to the standard noise reduction filter you also have one available in Camera Raw very effective

which one?

avatarjunior
sent on February 13, 2022 (21:57) | This comment has been automatically translated (show/hide original)

Filter --> Camera Raw -->
Luminanzain vers. 2022 has been moved

avatarjunior
sent on February 14, 2022 (16:17) | This comment has been automatically translated (show/hide original)

Stratospheric!!! Absolute wonder! Once I would like to see how you do it. I am from Vicenza

avatarsenior
sent on February 15, 2022 (0:42) | This comment has been automatically translated (show/hide original)

Filter --> Camera Raw -->
Luminanzain vers. 2022 has been moved

in the 2021 version in which tab is it?

avatarjunior
sent on February 16, 2022 (9:28) | This comment has been automatically translated (show/hide original)

Daniele, in Photoshop, in addition to the standard noise reduction filter you also have one available in Camera Raw very effective. If you didn't have a chance, try it ;-)

Good morning Serafino, thank you very much for the suggestion. I had discovered the existence of that filter just by reading one of your posts. I tried it, but I must say that the standard Photoshop one seemed better to me. In fact, with the same noise reduction, that of Photoshop creates a "silk" effect on the solar filaments that I prefer... It gives them more "structure"... but I could actually try again, I had done a test on the fly!
hello, Daniele

avatarjunior
sent on February 16, 2022 (9:39)


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

Click here to translate the comment in English [en]


" ma questo succede solo per il sole o per tutte le foto di astrofotografia?"
Buongiorno Mario, direi che in generale in astrofotografia c'è sempre una certa dose di elaborazione di quello che sarebbe il dato grezzo. In particolare non bisogna pensare che le foto di galassie e nebulose che vediamo su internet riflettano ciò che si vedrebbe al telescopio, per almeno due motivi: 1) i colori di stelle e nebulose sono spesso pompati mentre al telescopio si vedrebbe tutto molto più "desaturato" 2) anche la luminosità degli oggetti è modificata, o per dare più contrasto in particolare su Luna ed oggetti planetari, oppure al contrario per ridurlo e fare si che oggetti con una grande differenza di luminosità appaiano più omogenei. Due esempi tipici di questo sono la nebulosa di Orione M42 e la galassia di Andromeda M31. In entrambi i casi, le loro parti centrali sarebbero molto più luminose di quelle periferiche ed andrebbero a saturare se si mantenessero le luminanze reali, quindi si opera un processo per cui la luminosità delle parti esterne viene aumentata. Spero di averti risposto, altri nel forum potranno sicuramente aggiungere i loro commenti! Ciao, Daniele


avatarjunior
sent on February 16, 2022 (9:42) | This comment has been automatically translated (show/hide original)

Stratospheric!!! Absolute wonder! Once I would like to see how you do it. I'm from Vicenza

Hello Michele, thank you very much! I am from Montagnana (PD) and member of the amateur astronomers group of Legnago (VR). Unfortunately we have not organized events for the public since the beginning of the pandemic, when we resume you may come and visit us! hello, Daniele


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