AR12833 HUGE proms Animation ruined by temperature change :'(
- minhlead
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AR12833 HUGE proms Animation ruined by temperature change :'(
What a waste! I remote to my observatory and start capturing without realizing I forgot to turn on the temperature compensation on the Focuser. Since I was remoting from work, I have no idea the focus was off (the remote screen is blurry).
The result was disappointing despite the very good seeing this morning after a week of tropical storm . Hope you guys enjoy it, and I'd certainly remember to calibrate the temperature compensation the next clear sky I got. Be advised, the gif is BIG
The result was disappointing despite the very good seeing this morning after a week of tropical storm . Hope you guys enjoy it, and I'd certainly remember to calibrate the temperature compensation the next clear sky I got. Be advised, the gif is BIG
Last edited by minhlead on Tue Jun 15, 2021 11:16 am, edited 1 time in total.
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Re: AR12833 HUGE proms Animation ruined by temperature change :'(
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Re: AR12833 HUGE proms Animation ruined by temperature change :'(
We can seen the solar rotation !
Too bad for the focus shift. Next time will be OK.
Too bad for the focus shift. Next time will be OK.
Christian Viladrich
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Re: AR12833 HUGE proms Animation ruined by temperature change :'(
Thanks Christian. I certainly will be more careful next timechristian viladrich wrote: ↑Tue Jun 15, 2021 11:51 am We can seen the solar rotation !
Too bad for the focus shift. Next time will be OK.
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Re: AR12833 HUGE proms Animation ruined by temperature change :'(
It starts off great and lots of activity can be seen Wow! that's something I need, being able to remote telescope from work
Alexandra
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Re: AR12833 HUGE proms Animation ruined by temperature change :'(
Thanks Alexandra
I made my observatory with internet remote in mind. Everything can be controlled via desktop remote. It's automated and the roof will close when it's rain/cloudy/too windy. And it's relatively cheap. I built mine for about 700$ everthing included .
Here's a video of my observatory in action.The mount waits for the object to pass a threshold altitude before start aligning, focusing, guiding and capturing all automatically. The cloud recovery now works very well as well. At the end of imaging session (dawn), the scope will park itself, warm the CCD and the ROR closes.
The whole imaging session happened without any human input, just schedule with constrains.
output2 by Nguyen Minh, on Flickr
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Re: AR12833 HUGE proms Animation ruined by temperature change :'(
Minh, good animation, everyone is wrong.
You perform technical miracles. I think many will be interested to know about the construction of your observatory. By the way, you wanted to collect SSM, did you succeed?
Ivan
You perform technical miracles. I think many will be interested to know about the construction of your observatory. By the way, you wanted to collect SSM, did you succeed?
Ivan
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Re: AR12833 HUGE proms Animation ruined by temperature change :'(
Thanks Ivan,
It's not that hard actually. A lot of the tools are well written and documented online. You just need basic coding and engineering skills. I am not a coder by proffession just very basic knowledge.
I still could not find the time to make the SSM. The guide seems straight forward enough, I think I will get into making one in a week or 2
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Re: AR12833 HUGE proms Animation ruined by temperature change :'(
minhlead wrote: ↑Tue Jun 15, 2021 6:01 pmThanks Ivan,
It's not that hard actually. A lot of the tools are well written and documented online. You just need basic coding and engineering skills. I am not a coder by proffession just very basic knowledge.
I still could not find the time to make the SSM. The guide seems straight forward enough, I think I will get into making one in a week or 2
Minh, thanks, I'll look forward to it, just hope to repeat it later.
Ivan
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Re: AR12833 HUGE proms Animation ruined by temperature change :'(
Minh this is amazing what you have succeeded in building your remotely operated observatory!!!!
I did not even know that there is a possibility to compensate for temp change with the focuser! What focuser do you have?
Thanks for sharing all this!
Only thanks to Christian's comment, I saw the sun rotation! Amazing! For how long where you capturing?
Best wishes,
Alexandros
I did not even know that there is a possibility to compensate for temp change with the focuser! What focuser do you have?
Thanks for sharing all this!
Only thanks to Christian's comment, I saw the sun rotation! Amazing! For how long where you capturing?
Best wishes,
Alexandros
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Re: AR12833 HUGE proms Animation ruined by temperature change :'(
It still looks good.
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Re: AR12833 HUGE proms Animation ruined by temperature change :'(
Thanks James, Maurits, Alex.
@Alex: the optical path expands linearly with temperature change so it's quite easy to do calibration of a temperature based focus shift. (I.e: if temperature change by x degree then the focus move in/out by y steps). I use it all the time with my DSO capture software. You have to do a calibration for each optical rig though, since the shift constant is different from scope to scope. Observe the change in focus absolute step from observing temperature in a few time and divide them by the temperature change in degree, you'd have that constant. Some hi-end focuser have this feature hard coded to the firmware, you just have to put the constant in and it will compensate for the focus shift with onboard thermometer.
Mine (ZWO EAF) does not have this. It has to relied on the controlling software for this. And Sharpcap, AFAIK does not support this. Will have to find a way to overcome this. Maybe I'll write a little program piggyback on the ascom and compensate the shift independently, not supposed to be hard.
I am suspecting the focus shift effect is more severe with this case because of the large Delta T (+15*C) from start to end of the imaging session and the 4.3x barlow of the Quark magnifing the focus shift by 4.3 times so it's more pronounced. I have never had it this bad while doing DSO.
@Alex: the optical path expands linearly with temperature change so it's quite easy to do calibration of a temperature based focus shift. (I.e: if temperature change by x degree then the focus move in/out by y steps). I use it all the time with my DSO capture software. You have to do a calibration for each optical rig though, since the shift constant is different from scope to scope. Observe the change in focus absolute step from observing temperature in a few time and divide them by the temperature change in degree, you'd have that constant. Some hi-end focuser have this feature hard coded to the firmware, you just have to put the constant in and it will compensate for the focus shift with onboard thermometer.
Mine (ZWO EAF) does not have this. It has to relied on the controlling software for this. And Sharpcap, AFAIK does not support this. Will have to find a way to overcome this. Maybe I'll write a little program piggyback on the ascom and compensate the shift independently, not supposed to be hard.
I am suspecting the focus shift effect is more severe with this case because of the large Delta T (+15*C) from start to end of the imaging session and the 4.3x barlow of the Quark magnifing the focus shift by 4.3 times so it's more pronounced. I have never had it this bad while doing DSO.
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Re: AR12833 HUGE proms Animation ruined by temperature change :'(
Thanks Minh. Really impressive what you are doing and your ideas for improvement and automation as well!
What was the duration of your total capture to have the rotating sun in this animation?
Alexandros
What was the duration of your total capture to have the rotating sun in this animation?
Alexandros
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Re: AR12833 HUGE proms Animation ruined by temperature change :'(
bresser/messier 150/1200 (or 200/1800 Istar ) Mod -D-Erf 160mm intern-glasspath 1.25-etalon Pst barlow X2 ASI174
https://astropol.pagesperso-orange.fr/b ... 9/best2019
sorry for my English translators google
https://astropol.pagesperso-orange.fr/b ... 9/best2019
sorry for my English translators google
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Re: AR12833 HUGE proms Animation ruined by temperature change :'(
This animation is still very nice even though you missed the focus. The action looks wonderful! I do really like your remote setup, too. That's the way to go if it is possible (for me its not possible). Keep up the good work!
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Re: AR12833 HUGE proms Animation ruined by temperature change :'(
This is 3 hours of capturing. The key thing to get the sun rotation is aligning the frames by solar limb (using ImPPG) if you aligning using surface features (like most Fourier aligning algorithm does) the spot would be fixed and you wont see the rolling effect.
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