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INDI Library v1.8.6 Released (21 Aug 2020)

August 2020 release of INDI Library v1.8.6 introduces new drivers while providing fixes and improvements to existing devices and core framework.

ASI 2600mc pro: how to set the correct sensor temperature ?

3 months 4 days ago
suvowner
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ASI 2600mc pro: how to set the correct sensor temperature ? #55818
how do you like the 6200 over the 1600 ?

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3 months 4 days ago
astropaul
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ASI 2600mc pro: how to set the correct sensor temperature ? #55820
Hi guys,
thanks a lot for your answers!
I really appreciate it.

@wvreeven what kind of gai and offset you are using?
From my asi2600 quick guide is suggested to use the highest dynamic range, this mean that the gain is set to zero.
With gain at zero which is the correct offset?
However always from the quick guide is written that the ASI PRO cameras don't provide offset (and also USB limit) any more.... so I should no need to set the offset... right?

What you says about the master dark is wonderfull, in this way it is very convenient and saves you time during photo session... you will only need to take light frames.
The same thing colud be performed whit bias... with a master bias, right?
Regarding the master dark, the noise is not always distribuited in the same manner over the sensor, so in theory should be better to take the dark frames at the same time of light frames... but at this point I think that with the master dark or using the dark frame per session there is no much more difference in noise reduction, right?

thanks in advance!
Paolo

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3 months 4 days ago
wvreeven
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ASI 2600mc pro: how to set the correct sensor temperature ? #55822
@suvowner: I had some initial problems getting it to work. It requires a USB3 port otherwise it refuses to work. Apart from that, it works really well. Processing the images is quite a challenge since they are HUGE.

@astropaul: I also use gain 0. The offset is not cast in stone in the sense that you need to use a certain offset for a certain gain. I use offset 80. Not sure anymore where I got that number from. It seems to work for me though. I didn't know that ASI PRO cameras don't provide offset anymore though.

As for BIAS, I don't use them. I have read reports that say that BIAS images taken with ASI1600 cannot be trusted because they are not uniform. I use APP for image processing and with that I use a Master DarkFlat to calibrate the Flats and create a Master Flat. Then I use the Master Flat and a Master Dark to calibrate the lights. Again, I have taken DarkFlats at 1, 5 and 10 sec and make sure that my Flats always use any of those exposure times and I am done.


Wouter

ASI6200 and filter wheel with a SkyWatcher Esprit 80 ED on a SkyWatcher HEQ5-Pro
ASI1600MM-Pro Cooled and filter wheel with an 8" TS Ritchey-Chrétien on a SkyWatcher EQ6-R
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3 months 4 days ago
astropaul
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ASI 2600mc pro: how to set the correct sensor temperature ? #55823
@wvreeven thanks again for your answers.
You are using e very short exposure time for your photos, your technique is to make many shot at short time exposure ?
If yes, why do you prefer this metod instead of less photo at long time exposure?
The second metod should grant better quality imge, more dynamic range ... or not?

Paolo

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3 months 4 days ago
wvreeven
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ASI 2600mc pro: how to set the correct sensor temperature ? #55825
OK sorry, I should have been clearer. Those short exposures are for the Flats and DarkFlats. For my Lights I take 30, 60, 120 etc exposures depending on the light pollution, the object and the filter used. For the Lights I use Master Darks with the same exposure time as those Lights when I use the ASI1600. With the ASI6200 I use the same 60 sec Master Dark regardless of the exposure time of the Lights.

ASI6200 and filter wheel with a SkyWatcher Esprit 80 ED on a SkyWatcher HEQ5-Pro
ASI1600MM-Pro Cooled and filter wheel with an 8" TS Ritchey-Chrétien on a SkyWatcher EQ6-R
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3 months 4 days ago
astropaul
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ASI 2600mc pro: how to set the correct sensor temperature ? #55826
Ok wvreeven now is more clear for me :)
Thanks and compliments for your nice photos posted in your profile.

Today will be a clear night without moon, so I'll take my first photos with my new camera... always if will not occur problems.

Paolo
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3 months 4 days ago 3 months 4 days ago by suvowner.
suvowner
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ASI 2600mc pro: how to set the correct sensor temperature ? #55828
you should almost certainly not use gain 0 with these new Sony sensors, the read noise is much higher at gain 0, but at gain 100 the read noise drops significantly with a slight gain in dynamic range. it is something unique to these Sony sensors, this logic does not apply to the asi1600.

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3 months 4 days ago
wvreeven
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ASI 2600mc pro: how to set the correct sensor temperature ? #55829
Thanks for pointing that out. I failed to take the bottom diagram into account. I will start using gain 100 from now on. Luckily the lack of amp glow means that I only need to re-shoot one series of dark and that it!

ASI6200 and filter wheel with a SkyWatcher Esprit 80 ED on a SkyWatcher HEQ5-Pro
ASI1600MM-Pro Cooled and filter wheel with an 8" TS Ritchey-Chrétien on a SkyWatcher EQ6-R

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3 months 3 days ago
astropaul
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ASI 2600mc pro: how to set the correct sensor temperature ? #55833
@suvowner thanks a lot for your explantion.
So I'll use always gan 100 for better results.

Paolo

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3 months 3 days ago
Lead_weight
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ASI 2600mc pro: how to set the correct sensor temperature ? #55849
Using 100 gain is perfect if you're doing short subs where you can't take advantage of full well capacity, and need to image with light pollution.

However, if you have dark skies, and want to do long subs, you're better off at gain 0 so you can use the full well capacity of the sensor. This means you won't saturate bright areas as quickly, like getting blown out stars.

-Andrew
––––––––––
Mac Observatory - All about using the Mac for Astrophotography: www.macobservatory.com
Astrobin: www.astrobin.com/users/Lead_Weight/

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3 months 3 days ago
astropaul
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ASI 2600mc pro: how to set the correct sensor temperature ? #55852
Hi Lead_weight,
from my asi quick user guide i s written that using the Highest Dynamic Range setting (so with gain at zero) gives better results (as you also said) with longer exposures, but as well as with brighter (light polluted) skies.
So following this guide I'll need to use gain zero under light polluted skie... strange....

Thanks in advance!
Paolo

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3 months 3 days ago
suvowner
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ASI 2600mc pro: how to set the correct sensor temperature ? #55866
What leadweight is saying is generally true, however because of the huge drop in read noise at gain 100, which is unique to these new Sony sensors , his statement is most likely not correct.

Just know that this topic has been debated at length in various threads on cloudy nights, with often a lot of disagreement , so don’t take it from me, please watch the YouTube video by dr robin glover, the developer of sharp cap, also be sure and watch the follow video on gain settings, which is linked in the description

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