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  1. Galleries
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  3. Astrophotography
  4. » Shark Nebula RGB

 
Shark Nebula RGB...

Astrofotografia - Oscure

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Shark Nebula RGB sent on August 25, 2022 (15:38) by Mcastro. 7 comments, 195 views. [retina]

Ieri sera poco prima di cena mi chiama un amico visualista per dirmi se andavano insieme sotto il fantastico cielo di Murlo a fare nottata e cosi mi attrezzo e parto. Avevo in mente di fare questa bellissima oscura nel Cefeo e l'idea iniziale era di fare 5 ore di colore e 5 ore di luminanza iniziando dal colore per poi valutare cosa fare successivamente. In realtà sono rimasto talmente sorpreso dal risultato del solo RGB che ho deciso di spingerlo fin quanto potevo e non fare la luminanza (se non un veloce passaggio di sintetica). Se mi fossi ricordato di togliere l'IDAS P3 dal correttore sarebbe stato meglio ma quando me ne sono ricordato era troppo tardi e quindi pace, sicuramente qualche sfumatura di colore me la sono giocata. Pazienza. La serata è stata bellissima, con il cielo che verso l'una ha raggiunto una trasparenza notevole tant'è che ci siamo divertiti a osservare tantissimi oggetti. Devo ammettere che un telescopio per osservare durante una sessione di astrofotografia è davvero molto appagante e poi in compagnia di uno che conosce il cielo come le sue tasche è perfino istruttivo. Ho fatto 30 pose da 300s seguite da 30 pose da 30s per canale RGB, facendo il dither ogni 2 pose per ritrovarmi alla fine con 2 master per canale da fondere in HDR (per i nuclei stellari che a me stanno tanto cari). La maschera di spike (fisica, sul tubo) ha fatto il suo laoro anche se forse sto snaturando un pò questo quintupletto (!). Come colore rispetto alle versioni precedenti mi sono tenuto "caro" il rosso per farla un pò diversa e più "dark". ASI2600mm/FRA500@350/GEM45


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avatarsenior
sent on August 25, 2022 (15:47) | This comment has been automatically translated (show/hide original)

Beautiful, although I personally find spikes a disturbing element.
I would only pick up a few frames with the cap, so I could have both versions.

avatarjunior
sent on August 25, 2022 (16:18) | This comment has been automatically translated (show/hide original)

Thanks Giancarlo, I mounted a spike mask to bring out the blue from the stars. Alas unfortunately with the apo there is no way to see the blue in the stars.
It was a test and I didn't mind, now I try it without it.

avatarsenior
sent on August 25, 2022 (16:19) | This comment has been automatically translated (show/hide original)

Do you use PixInsight?

avatarjunior
sent on August 25, 2022 (16:36) | This comment has been automatically translated (show/hide original)

Yes.

avatarsenior
sent on August 26, 2022 (12:20) | This comment has been automatically translated (show/hide original)

Have you tried with the regularization of the flows (Flux calibration and 3BEstimator) and the Photometric Color Calibration?
The combination of these two processes is able to obtain the color of the stars even from shooting in a narrow band.

avatarjunior
sent on August 26, 2022 (12:47) | This comment has been automatically translated (show/hide original)

The CCP tried and tried again and rarely satisfied me. The other 2 I don't know, I do some research.

avatarsenior
sent on August 26, 2022 (12:56) | This comment has been automatically translated (show/hide original)

The PCC should be the one that allows you to get closer to the real colors, but it must be used with knowledge, many parameters must be valued on the basis of the type of subject taken.


RCE Foto

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