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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, 1303 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
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sent on October 16, 2017 (23:33) | This comment has been automatically translated (show/hide original)


avatarsenior
sent on October 17, 2017 (8:54) | This comment has been automatically translated (show/hide original)


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 has been automatically translated (show/hide original)


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
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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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