RCE Foto

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  1. Galleries
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  3. Astrophotography
  4. » Moon at 4500 mm equivalent (color version)

 
Moon at 4500 mm equivalent (color version)...

Astrofotografia lunghe focali Fuj

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Moon at 4500 mm equivalent (color version) sent on November 27, 2020 (15:08) by Daniele Bonfiglio. 8 comments, 1149 views. [retina]

1/100 f/22.0, ISO 640, tripod.

Fotocamera al fuoco diretto di un Maksutov-Cassegrain da 1500 mm di focale. Versione a colori della foto che ho postato ieri.



View High Resolution 25.2 MP  



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avatarsenior
sent on November 27, 2020 (16:32) | This comment has been automatically translated (show/hide original)

Charming and mysterious!! :-o

avatarsenior
sent on November 28, 2020 (9:53) | This comment has been automatically translated (show/hide original)

Very sharp...
A greeting Gianka

user65640
avatar
sent on November 28, 2020 (14:03) | This comment has been automatically translated (show/hide original)

Micro-blurred and micro-moved very evident, it is the limit of the single shot at such important focals due to the seeing.
Do you have to try to make at least a 30in of poses and add them in autostakker, then see what difference (this also attenuates the grain due to seeing).

avatarjunior
sent on November 28, 2020 (15:00)


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 e grazie dei vostri commenti.
Buongiorno Mc0676, non l'ho scritto nella descrizione ma questa è già una somma di 50 migliori foto su 200 con il software Planetary System Stacker. Ovviamente è stato operato anche dello sharpening sempre con lo stesso software, poi ho aumentato la saturazione dei colori con GIMP (ma solo su un layer senza sharpening) e infine corretto con registax l'effetto dell'indice di rifrazione della atmosfera che dipende dalla lunghezza d'onda delle luce (RGB align, anche se questo passaggio vorrei rifarlo).
Detto questo, non mi sembra di vedere del micromosso, e il dettaglio è davvero al limite del potere risolutivo del mio strumento (ho anche usato un moltiplicatore di focale). Forse c'è un po'di grana dovuta al fatto che ho spinto la saturazione,ma mi sembra accettabile. Tieni conto anche che ho usato la mirrorless in modalità otturatore elettronico proprio per evitare il micromosso che avevo per esempio con la mia vecchia Canon.
Se confronti la mia foto con delle mappe lunari vedrai che dove ci sono piccoli crateri che sembrano sdoppiati, sono davvero doppi. Ciao, Daniele


avatarjunior
sent on November 28, 2020 (15:17) | This comment has been automatically translated (show/hide original)

For example, between copernicus and eratosthenes craters there is a dotted strip that looks like an error of stacking or noise, but if you compare it to a lunar map you can see that they are micro craters. Or the Alpine Valley in the center of which you can see a very thin darker line that is in fact the so-called rhyme in the Alpine valley, as you can see very well for example in this beautiful photo www.juzaphoto.com/galleria.php?t=374490&l=it

user65640
avatar
sent on November 28, 2020 (23:34) | This comment has been automatically translated (show/hide original)

Hi Daniele, I believe it. I brought back the effect I feel in looking at it 100%.
I'm weird, I normally stakko a 20/40 ina of images and that grain effect disappears me with the sum, maybe as you say it's a talk of decisive power, it may be I don't know.

avatarjunior
sent on November 29, 2020 (8:33) | This comment has been automatically translated (show/hide original)

Hi Mc, thank you for the clarification. Let's say that with the 2x focal multiplier I am right at the theoretical resolution limit related to the diffraction of light, which for my instrument is about 0.3 arcsec/pixel while with my instrumentation I push myself a little below, that is to 0.27 arcsec/pixel. However, yesterday I did a test of the comparison between a detail of this photo and the same area with skysafari. As you see in the screenshot at this link photos.app.goo.gl/eKJpTNxLhjhgPY2k8
I
feel like even at this level of detail (facilities in the order of 10 km) I can find a great deal.
Thank you so much for the passage, my goal is to improve more and more in lunar/planetary photos.
Buona Sunday, Daniel

avatarjunior
sent on January 22, 2021 (10:17) | This comment has been automatically translated (show/hide original)

Good morning everyone,
altho good morning also to answer the right doubts expressed above by Mc0676, I did the study reported here: www.juzaphoto.com/galleria.php?t=3846262&l=it
This
study confirms that the "artifacts" in the minute details of the photo, are neither micromoxes nor any defects of optics, but actually due to the diffraction limit of the instrument.


RCE Foto

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