Sun, August 7, 2014

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Astrophotography

14.0 MEGAPIXEL

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Astrofotografia View gallery (25 photos)

Sun, August 7, 2014 sent on August 07, 2014 (9:30) by Mario54. 6 comments, 1181 views.

1/6 f/11.0, ISO 100, tripod.

Sole e macchie solari; foto eseguita con telescopio Meade ETX90+filtro solare.

View High Resolution 14.0 MP

4 persons like it: Astrotrezzi, Beppe Reda, Fedex00, Medri Silverio

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user15434

sent on August 07, 2014 (11:57)

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Un bel Sole!!! Ottima immagine... soprattutto considerata la difficoltà tecnica di riprendere con l'ETX!!!
Hai però il sensore un po' sporchino MrGreen

... un bel flat non avrebbe fatto male ;-)

Un saluto e alla proxima,
Davide

A beautiful sun! Excellent image ... especially given the technical difficulty to shoot with the ETX!
However, you have the sensor a little 'dirty:-D ... a nice flat would not hurt ;-)
Greetings and proxima,
David

Mario54

sent on August 07, 2014 (16:08)

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Davide, la D5300 ha 3 giorni di vita, quindi il sensore non centra...forse un po' di post-produzione;comunque tieni presente che il Sole non ha una superficie liscia, e' come se avesse sulla sua superficie dei cicchi di riso(foto Nasa).Ciao Mario

David, the D5300 has 3 days of life, then the sensor is not centered ... maybe a little 'post-production, however, keep in mind that the Sun does not have a smooth surface, and' as if he were on the surface of the Cicchi rice (NASA photo). Hello Mario

user15434

sent on August 07, 2014 (17:17)

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Ciao Mario,
quello a cui mi riferivo io è la polvere/sporco sul sensore e non la granulazione fotosferica ;-)

. Si vede meglio nell'ingrandimento qui sotto dove ho tirato un po' l'immagine per evidenziarne le macchie:

Queste macchie sono sicuramente sul sensore dato che eventuale sporco sull'obiettivo non viene messo a fuoco (sei all'infinito). Inoltre non possono essere difetti di post-produzione ne particolari fisici del disco solare. Unica possibilità potrebbe essere che hai scattato in proiezione d'oculare. In questo caso la polvere potrebbe essere sull'oculare e non sul sensore. Qui sotto trovi un'immagine di un flat fatto con la mia Canon EOS40D... ritroverai le stesse macchie con la tipica immagine di diffrazione (oltre a dei topi morti che mi sono caduti sul sensore nel corso degli anni MrGreen

)

In ogni caso non è un problema grave e le macchie/polvere si puliscono... certo che se la camera a solo 3 giorni di vita mi incacchierei un attimo con chi me l'ha venduta!!! Per curiosità prova a fare una foto al cielo sereno esponendo correttamente e vedi se le macchie ci sono ancora. Magari era semplicemente polvere ed è già "volata" via.
Un saluto e alla proxima,
Davide

Hello Mario,
that to which I was referring is the dust / dirt on the sensor and not the photospheric granulation ;-). Is best seen in the enlargement below where I pulled a little 'the image to highlight the spots:

These spots are definitely on the sensor since any dirt on the lens is not focused (six to infinity). They also can not be defects in post-production it physical details of the solar disk. The only possibility would be that you have taken in the projection of the eye. In this case the powder may be on the eyepiece and not on the sensor. Below you find an image of a flat made with my Canon EOS40D ... find yourself the same spots with the typical diffraction image (in addition to the dead mice that I have fallen on the sensor over the years:-D)

In any case it is not a serious problem and stains / dust clean ... of course if the room in just 3 days of my life incacchierei a moment with those who sold it to me! Out of curiosity tries to take a picture of the sky exposing correctly and see if the stains are still there. Maybe it was just dust and is already "flown" away.
Greetings and proxima,
David

Mario54

sent on August 07, 2014 (19:03)

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OK Davide, domani farò la prova che tu dici ed eventualmente se il sensore dovesse essere sporco, tenterò con la pulizia incorporata nel sistema della macchina.Grazie Mario

OK David, tomorrow I will do the test and, if you say that if the sensor were to be dirty, I will try with the built-in cleaning system macchina.Grazie Mario

user15434

sent on August 07, 2014 (19:13)

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Ok, fammi sapere se è andato tutto bene! Se è polvere dovrebbe scivolare via ;-)

in bocca al lupo e a presto,
Davide

Ok, let me know if everything went well! If dust is expected to slip away ;-)
good luck and see you soon,
David

Mario54

sent on August 07, 2014 (20:04)

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Non potevo aspettare domani.....Ho fatto una prova ed effettivamente c'è una piccola macchiolina sul sensore che ho marcato in rosso con Photoshop.Volevo mandarti una foto del test, ma no so come fare!Ciao Mario

I could not wait for tomorrow ..... I did a test and actually there is a small speck on the sensor which I have marked in red with Photoshop.Volevo send you a photo of the test, but do not know how! Hello Mario

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