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Guide camera and cooling?

astrophotography CMOS
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#1 Michal Juul

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Posted 22 May 2019 - 03:05 AM

Is it an advantage to have a guide camera with cooling?

 

I have ZWO Camera ASI 120MM Mini Mono without cooling.
But consider buying "Altair USB Cooler Module"

https://www.altairas...ler-Module.html

 

Regards

Michal



#2 Tapio

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Posted 22 May 2019 - 03:27 AM

I'd say it makes no difference to guiding.


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#3 happylimpet

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Posted 22 May 2019 - 03:37 AM

This item will make a tiny difference in terms of noise reduction.  Regulated cooling will help a bit more, especially as it will ensure that the darks match well. (Make sure you use darks!)



#4 OldManSky

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Posted 22 May 2019 - 07:56 AM

Generally, cooling reduces dark current.

Guider exposures are generally very short -- 1 to 5 seconds or so.  There isn't much accumulation of dark current in such short exposures.

Cooling will reduce the apparent noise a little bit.  But with a camera like yours, it won't make any difference at all in the quality of the guiding.



#5 cfosterstars

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Posted 22 May 2019 - 10:44 AM

I actually tried it with a nice cooled camera for guiding. It made no difference at all that I could tell. The best thing to improve your guiding - outside of a premium mount smile.gif - is to be sure that your guider pixel scale is about 1-2"/pixel. I really does not matter what your camera and main OTA pixel scale is. 1-2"/pixel will average well over the seeing and not starve PHD2 for data by having all the star on a single pixel or two. 


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#6 Michal Juul

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Posted 23 May 2019 - 12:19 AM

Thank you all many times.

 

happylimpet:
Do you mean darks calibration frames?



#7 happylimpet

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Posted 23 May 2019 - 05:09 AM

Thank you all many times.

 

happylimpet:
Do you mean darks calibration frames?

Yes - for my ASI120MM guide camera they seem to help a lot, even when the temperature isnt really the same as when I took them (like now). PHD2 does this easily (just put the cap on and take some, as I recall).




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