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Issue with skyguider pro, (i think)

astrophotography mount
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#1 EmilioO

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Posted 26 March 2020 - 07:10 AM

Hi all! Im new here.. In the last nights i got several problems with my astriohotography attempt.. Just bought a ioptron skyguider pro, i did all the alignment and all the stuff process, but i got "intermittent" pictures, some with perfect round stars and other pictures with trails. Tought it was the clutch so i thigthened, but it keep taking bad pics. It goes like in the video.. Any one had the same issue or know how to solve it? frown.gif

 

https://youtu.be/4u7JHumPC4g


Edited by EmilioO, 26 March 2020 - 07:20 AM.


#2 bobzeq25

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Posted 26 March 2020 - 09:20 AM

A common problem is losing polar alignment if you move the camera.  The last thing I do before starting the wireless intervalometer is take a look through the polar alignment scope to see it's still good.


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#3 sg6

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Posted 26 March 2020 - 09:32 AM

Few questions:

What are you getting the images with, basically which camera ?

What settings for the intervalometer have you specified if it is a DSLR ?

What setting have you set on the DSLR itself ?

 

As an idea I would expect the Intervalometer to be say 30 second exposure and a 10 second wait between each exposure.

The DSLR should be in Manual operation and manual focus and set to B for exposure, Noise Reduction Off.

 

The video almost looks like a DSLR is trying to obtain some form of autofocus.


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#4 astrodom

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Posted 26 March 2020 - 09:35 AM

I was going to ask what the total weight of your system is.  For my camera with a wide field lens, the tracking is amazingly accurate, but with my z61 and camera on it, I get a mix of good tracking and egg shaped stars with the skyguider pro.  I think when you work a the greater weights, it gets harder to get consistent results, but this is just my own experience.  I would double check the polar alignment.  Good luck.



#5 EmilioO

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Posted 26 March 2020 - 10:56 AM

Few questions:

What are you getting the images with, basically which camera ?

What settings for the intervalometer have you specified if it is a DSLR ?

What setting have you set on the DSLR itself ?

 

As an idea I would expect the Intervalometer to be say 30 second exposure and a 10 second wait between each exposure.

The DSLR should be in Manual operation and manual focus and set to B for exposure, Noise Reduction Off.

 

The video almost looks like a DSLR is trying to obtain some form of autofocus.

1.- im getting the image with a canon 6d mark ii

2.- 2 min exposure, 5 secs between shots

3.- bulb mode, iso 1600, focus is fixed in 4.9, (got the redcat 51).

 

I tried shoting 1 pic after another manually, to see if it was something about the tiem between pics, but it was the same :(.

About the dslr it is in manual focus, 



#6 EmilioO

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Posted 26 March 2020 - 11:00 AM

I was going to ask what the total weight of your system is.  For my camera with a wide field lens, the tracking is amazingly accurate, but with my z61 and camera on it, I get a mix of good tracking and egg shaped stars with the skyguider pro.  I think when you work a the greater weights, it gets harder to get consistent results, but this is just my own experience.  I would double check the polar alignment.  Good luck.

Hmmm i bought the same setup of peter zelinka, here is a picture of my setup, thats why i thought the weight wasnt on fault. But ill try doing it with only my camera and a light lens, to see if it changes


Edited by EmilioO, 26 March 2020 - 11:04 AM.


#7 EmilioO

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Posted 26 March 2020 - 11:00 AM

This is my setup

 

https://www.instagra...id=1bk3drnj0rg8



#8 TelescopeGreg

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Posted 26 March 2020 - 05:27 PM

Thanks for the movie.  That helps. 

 

Looks to me like periodic error, since what I'm seeing is an oscillation back and forth (er, up and down).  I had a similar issue with my setup early on, and made a similar movie:

 

https://www.dropbox....acking.mp4?dl=0

 

The effect is a lot more pronounced with mine, as this was with an 8" f/5 Newtonian telescope instead of a camera and lens.  The issue might be minimized if your mount has a way to calibrate out its PE (called Periodic Error Correction, PEC), but the answer for me was to invest in an auto guider solution.  Image stabilization on steroids...


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#9 EmilioO

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Posted 26 March 2020 - 08:31 PM

It solved! I took 10 pics of 2 min and 10 pics of 3 mins, perfect rounded stars! I did 2 things, i saw another post of a similar issue, it suggested to hold the mode buttom and turn on the skyguider, it will start to go to 1 side for 8 min and then turn back (its something like calibrating). After that i cleared the positions of the ipolar. After that all went well! Thanks all for your advices :D




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