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Jupiter & Saturn 16 Jul 19 - SW Dob 14" Goto

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#1 leoyasu

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Posted 18 July 2019 - 02:43 PM

Hi all! Here I am returning to the planetary imaging after the failed oppositions for climatic reasons. This time I spent a little more time on Saturn since he was well up in the sky. I'm also trying with videos of up to 1.5 minutes instead of 60 seconds. As I record at 70 fps I am looking for more frames to be stacked by video but with the caution that the field rotation does not interfere much. With a minute and a half of recording I am achieving 50% more of total frames per video which translates into more total final stacked frames (and fortunately WinJupos seems to handle these times well even with a altazimuthal mount.). Finally, I had to lower the weight of the blue channel and increase the weight of the red channel in FireCapture since the ZWO 120 MC-S brought a blue histogram 20% higher than the rest. In this way, I managed to have a more balanced histogram in the order of 60% or 70% with Jupiter and 40% with Saturn.

 

In total, I obtained half an hour in two rounds of Jupiter (15 min.) and one hour for Saturn, divided into 4 rounds of 15 minutes with varied integrations of one minute or a minute and a half for comparisons. Also, I was able to test different forms of processing in RS6 and PS. I hope you like it!

 

2019-07-16-0245_8-LY-Jup.jpg 2019-07-16-0304_1-LY-Jup.jpg

 

2019-07-16-0323_2-LY-Sat.png 2019-07-16-0345_1-LY-Sat.jpg

 

2019-07-16-0401_8-LY-Sat.png 2019-07-16-0511_8-LY-Sat.png

 

Leo.


Edited by leoyasu, 18 July 2019 - 02:45 PM.

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#2 RunningMan

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Posted 18 July 2019 - 03:32 PM

Beautiful images!! 


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#3 Tulloch

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Posted 18 July 2019 - 04:38 PM

Great images - are you aware that WinJupos removes field rotation (as well as planetary rotation) from videos taken with AltAz mounts? Check here for more info

 

https://www.planetar...azimuth-dobson/

 

Thanks for sharing.

 

Andrew


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#4 CPellier

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Posted 19 July 2019 - 03:04 AM

Beautiful images with an altaz dob. As Andrew says you could do even better by using field rotation correction with WinJupos !


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#5 leoyasu

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Posted 19 July 2019 - 12:31 PM

Thanks for the kind comments! Christophe I had already read your tutorial (as well as others from your site grin.gif) about dealing with the field rotation on videos. Honestly I still did not start doing tests with de-rotation and compensation of video streams due to the additional work that would be. I still don't know if with a short integration I would benefit from that (1.5 min. per video or less and especially with comments like this one). Anyway, I'm going to do a test with the videos of the first batch of Jupiter or with the second of Saturn.



#6 Tulloch

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Posted 19 July 2019 - 06:55 PM

Thanks for the kind comments! Christophe I had already read your tutorial (as well as others from your site grin.gif) about dealing with the field rotation on videos. Honestly I still did not start doing tests with de-rotation and compensation of video streams due to the additional work that would be. I still don't know if with a short integration I would benefit from that (1.5 min. per video or less and especially with comments like this one). Anyway, I'm going to do a test with the videos of the first batch of Jupiter or with the second of Saturn.

Hi there, you are correct, with only 1.5 minute videos you will probably not see any advantages. However, you said you sample at 70fps and wanted more frames to stack. You could record for longer and get more frames, but field rotation would be an issue. I capture for 8 minutes at 20 fps and derotate my videos, it works very well.

 

Andrew


Edited by Tulloch, 20 July 2019 - 05:29 PM.

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#7 Lunatiki

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Posted 20 July 2019 - 02:47 PM

very nice! I can see the 5 sided S. Pole feature in your image. Very impressive.

 

Regards,

Joel


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#8 KD58

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Posted 20 July 2019 - 04:11 PM

Wonderful images. I wish I had a small proportion of your skills.

Khavar


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#9 alvarete

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Posted 30 May 2020 - 04:18 AM

Hola Leo!,
fantastis images. Indredible ones. I am considering one 14" for strictly visual use. Can you say me about locating and following objects with this scope? Can you say me about the optics in comparison wirh say hight grade optics?
Muchas gracias from Spain
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#10 Az Frank

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Posted 30 May 2020 - 01:52 PM

Excellent detail in all images. Well done!


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#11 sunnyday

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Posted 30 May 2020 - 02:05 PM

the details are present in all your photos with pretty colors.
thank you and well done.


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#12 leoyasu

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Posted 03 June 2020 - 01:49 PM

Thanks everybody! Just yesterday I started with the 2020 planetary season grin.gif .

 

I am considering one 14" for strictly visual use. Can you say me about locating and following objects with this scope? Can you say me about the optics in comparison wirh say hight grade optics?
Muchas gracias from Spain

Hola Alvarete! Regarding the scope's tracking and GoTo capabilities are actually pretty good. You must be careful to choose good stars to align tho, this is 2 opposite stars and at the same altitude if possible. The further away the better. Sometimes at x330 objects are in or very close to the center of the field after a GoTo and when tracking a planet I've to correct every once in a while at nearly 3600mm. Also dual encoders are a plus and with the pointing accuracy enhancement (PAE) you can correct aligment with every object you look.

 

About the optics, I didn't have the chance to compare them with those high end optics but I am happy with them (at least for the use I give them). Over the past year, I've run a few tests with the WinRoddier. The images were taken with the ZWO120MC-S and from which the green channel was extracted for analysis. I got relative strehl of 0.89 or so with 20-25 defocus waves and stacks of 2000, 5000 and 10000 frames but I would like to repeat these tests with a better seeing. Anyway, I think the best upgrade for these types of mass produced scopes is to modify the secondary mirror (by replacing it or removing the double sided tape). When removing secondary mirror attributed flaws, the score goes up in WinRoddier.

 

Regards, Leo.


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#13 TareqPhoto

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Posted 04 June 2020 - 02:51 PM

And why they say a Dob or Newt isn't the good for planetary?

 

Your topic came on time as i am planning to stop research or searching and just get a dob, 14" was my plan, i saw someone had an article with 14"Dob and now you, so i feel they are signs that i can buy it safely for planetary imaging and visual, and by the time passing i will add more accessories to it and learn how to manage it better, thank you.


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#14 DMach

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Posted 05 June 2020 - 12:20 AM

Amazing images there, congrats!



#15 alvarete

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Posted 05 June 2020 - 11:25 AM

Many thanks for take the time and effort of answer me.
Go on with your magnificient work!
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#16 leoyasu

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Posted 07 June 2020 - 12:47 PM

Thanks guys! Darren, I use your photos as guidance! Now I just ordered the new QHY 462 with smaller pixels, we shall see what happens grin.gif



#17 TareqPhoto

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Posted 07 June 2020 - 01:25 PM

Thanks guys! Darren, I use your photos as guidance! Now I just ordered the new QHY 462 with smaller pixels, we shall see what happens grin.gif

Where is the link for this camera QHY 462?



#18 leoyasu

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Posted 08 June 2020 - 10:34 PM

Check https://www.cloudyni...nd-qhy5iii462c/ or QHY social media

#19 treelo

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Posted 11 June 2020 - 04:35 AM

/////



#20 troyt

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Posted 11 June 2020 - 05:03 AM

good images Leo waytogo.gif



#21 TareqPhoto

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Posted 04 July 2020 - 05:35 PM

Check https://www.cloudyni...nd-qhy5iii462c/ or QHY social media

Thank you very much!




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