Timelapse of a Quark gradually going off band
- minhlead
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Timelapse of a Quark gradually going off band
I forgot to turn on my DIY active cooler for my Quark and you can see on the video that it gradually goes off band due to the insane ambient temperature (almost 50*C out in the sun light today).
Really should have turned that cooler on. But it's cool seeing the CWL gradually shift due to the rising temperature.
Really should have turned that cooler on. But it's cool seeing the CWL gradually shift due to the rising temperature.
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- cmas
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Re: Timelapse of a Quark gradually going off band
Very high quality animation anyway!
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Re: Timelapse of a Quark gradually going off band
Beautiful animation Minh, looks like I seem to see rats walking...
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Re: Timelapse of a Quark gradually going off band
Thanks, Cmas, Maurits.
@Maurits it sure does look like lines of ants
@Maurits it sure does look like lines of ants
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Re: Timelapse of a Quark gradually going off band
It's a great animation with lots of activity, but yes, you are gradually entering the red wing
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Re: Timelapse of a Quark gradually going off band
This is pretty cool and a nice resource, if you don't mind i'll leave it here a couple of days and then pop it in the solar reference library
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!
- minhlead
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Re: Timelapse of a Quark gradually going off band
No problem, Markmarktownley wrote: ↑Wed Jul 28, 2021 3:33 pm This is pretty cool and a nice resource, if you don't mind i'll leave it here a couple of days and then pop it in the solar reference library
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Re: Timelapse of a Quark gradually going off band
On the other hands, you do have an automatic "Doppler scanner" over spectrum. If this landscape will be at a larger AR with some black filaments, such a "Doppler scanner" should show big changes in pictures.
Try this with such an AR.
BTW Your Quark shows here an excellent homogeneity. Or it was flat field corrected?
Valery
Try this with such an AR.
BTW Your Quark shows here an excellent homogeneity. Or it was flat field corrected?
Valery
Last edited by Valery on Thu Jul 29, 2021 7:18 pm, edited 1 time in total.
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Re: Timelapse of a Quark gradually going off band
Thanks, Valery. I'll try again later as you suggested.Valery wrote: ↑Thu Jul 29, 2021 1:54 am On the other hands, you do have a automatic "Doppler scanner" over spectrum. If this landscape will be at a larger AR with some black filaments, such a "Doppler scanner" should show big changes in pictures.
Try this with such an AR.
BTW Your Quark shows here an excellent homogeneity. Or it was flat field corrected?
Valery
My Quark does have some un-uniformity but I cropped it out with ROI. I use a M4/3 sensor so there are plenty of room to crop.
I also use flats to calibrate my light frames.
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Re: Timelapse of a Quark gradually going off band
Interesting to see the changing view through the sweep with little filaments popping into the scene.
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Re: Timelapse of a Quark gradually going off band
An excellent animation with remarkable clarity.minhlead wrote: ↑Tue Jul 27, 2021 2:19 pm I forgot to turn on my DIY active cooler for my Quark and you can see on the video that it gradually goes off band due to the insane ambient temperature (almost 50*C out in the sun light today).
Really should have turned that cooler on.
But it's cool seeing the CWL gradually shift due to the rising temperature.
I wonder if your high temperatures have minimised the refractive index differential between thermal air currents?
Was the sun's local altitude almost overhead? Thereby minimising the atmospheric path length.
Have I missed your guide to DIY active camera cooling?
My ASI174 is getting up around 50C after a long day of imaging. Noise increases.
Evaporative cooling has crossed my mind.
An external, blower fan would [probably] be of limited value.
As would adding a sleeve of cooling fins around the camera body.
Much like the cylinder of an air-cooled engine.
A cowled fan and fins for greater efficiency?
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Re: Timelapse of a Quark gradually going off band
It is interesting isn't it? But it also show the effect of high ambient temperature on a Quark. People buying Quarks should be aware of this. Without this knowledge, a lot of Quark users is gonna end up with a Quark that's unusable at their local climate.
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Re: Timelapse of a Quark gradually going off band
I think if it does anything, the high ambient temperature only worsen seeing due to rising air. I am observing from a rooftop observatory (on the 5th floor) and it's some what help with the near ground rising air. I'd rate the seeing of this particular imaging session 7.5/10.Rusted wrote: ↑Thu Jul 29, 2021 5:33 am I wonder if your high temperatures have minimised the refractive index differential between thermal air currents?
Was the sun's local altitude almost overhead? Thereby minimising the atmospheric path length.
Have I missed your guide to DIY active camera cooling?
My ASI174 is getting up around 50C after a long day of imaging. Noise increases.
Evaporative cooling has crossed my mind.
An external, blower fan would [probably] be of limited value.
As would adding a sleeve of cooling fins around the camera body.
Much like the cylinder of an air-cooled engine.
A cowled fan and fins for greater efficiency?
I am using a cooled QHY294C (a color camera) to do imaging and it's cooled to 0*C which helped a lot with thermal noise. But I am looking to upgrade to a QHY174M and having a thought about making a TEC cooler for the camera itself.
Currently I have a cooler for my Quark which refuses to work correctly when ambient passed 38*C mark which is a given on a sunny day here in VN. If I turn on the cooler (for the Quark) then it's works fine. Below are my DIY topic.
viewtopic.php?f=9&t=31794
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Re: Timelapse of a Quark gradually going off band
So, I'm curious, how much does that matter, really?
I've done planetary photography before, and thermal noise doesn't seem to matter there - you're averaging over so many frames in the stack that the noise just disappears. Is this different in some way?
I had a cooled ASI178MM but I sold it recently because I thought I'll have no real use for it. I'm thinking to get an ASI290MM for solar, but of course it has no cooling from the factory.
I just got started with H-alpha photography a few days ago and I'm using now an ASI071MC-Cool - but it's color, and it's huge. Probably not optimal. I have not used the active cooling at all for H-alpha.
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Re: Timelapse of a Quark gradually going off band
Dark current noise (which depends on temperature) does not seems to be a problem with solar imaging the same reason it's not for planetary imaging: The exposure time is very short. Dark current is a time and temperature dependent (expressed as -e/sec and varies at given temperature) so with very short exposure, the dark current accumulation is negligible and can be counted out. That's why a lot of planetary (and solar) imager does not take dark frame calibration. Also the plentiful of light in solar-planetary imaging also drown out the dark current generated noise (and read noise for that matter) so they are generally ignored . Hence solar imager does not take bias and dark frames.Florin Andrei wrote: ↑Thu Jul 29, 2021 7:26 amSo, I'm curious, how much does that matter, really?
I've done planetary photography before, and thermal noise doesn't seem to matter there - you're averaging over so many frames in the stack that the noise just disappears. Is this different in some way?
I had a cooled ASI178MM but I sold it recently because I thought I'll have no real use for it. I'm thinking to get an ASI290MM for solar, but of course it has no cooling from the factory.
I just got started with H-alpha photography a few days ago and I'm using now an ASI071MC-Cool - but it's color, and it's huge. Probably not optimal. I have not used the active cooling at all for H-alpha.
But on the other hand, the hot-pixels, which is the pixels that got activated regardless of the signal is the problem here.
The hot-pixel is also temperature dependent (it's an other expression of dark current on defective pixel). The hotter the sensor get, the brighter the hot-pixels get (and there will be more of them too).
Because the solar cameras capture frames very fast (just a few seconds each burst of hundreds if not thousands of frames), the hot pixels tends to be stationary or varies very little on the captured frames due to seeing or mount's tracking drift. And because a lot of stabilization algorithm used on solar stacker (AS3!, Registax...) out there are contrast based, the hot-pixels (which can be considered high contrast features) often got aligned together and stacked even if they have very slight "dither" between frames. So stacking frame may or may not get rid of the hot pixels and I have seen case of hot pixels jumping all around the frames.
So yes, high temperature can affect your output image when imaging solar. Not to mention very high temperature WILL shorten your sensor life and make even more hot-pixel to appear over time when the silicon degrade.
Last edited by minhlead on Thu Jul 29, 2021 10:46 am, edited 1 time in total.
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Re: Timelapse of a Quark gradually going off band
Very interesting Minh!
Thank you very much for sharing this great example!
Best regards,
Arne
Thank you very much for sharing this great example!
Best regards,
Arne
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Re: Timelapse of a Quark gradually going off band
Thanks, Arne, Rod.
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Re: Timelapse of a Quark gradually going off band
It's an interesting case, Minh, indeed!
What is the time span of animation?
regards
Leo
What is the time span of animation?
regards
Leo
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Re: Timelapse of a Quark gradually going off band
Thanks, Leo. It was about 2 hours
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