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#1
29-11-2018, 09:05 PM
 Eris Registered User Join Date: Mar 2007 Location: Mount Barker SA Posts: 68
Another Dark Question

Hi Everyone,
I am about to make up a Library of Dark frames and have a question of how accurate they are when it comes to processing images.
Let’s say for argument sake that I create a series of Dark frames at -20°C below ambient temperature at 10 minutes each. Then on an observation night I take a series of Light frames again at -20°C below ambient each lasting 10 minutes.
The question is this. If those Dark frames taken at -20°C below ambient with a room temperature of 18°C be accurate enough when Light frames are taken in a night temperature of 8°C? Both sets are taken at a set point of -20°C but the starting temperature is different?
Does this difference affect the quality of the Light frame being processed?

Thanks in advance to all who can help me understand this issue more clearly.
#2
29-11-2018, 09:43 PM
 RickS (Rick) PI cult recruiter Join Date: Apr 2010 Location: Brisbane Posts: 10,581
You need to take the darks and lights at the same absolute temperature, not at some offset from ambient. Pick a temperature that you can achieve for both darks and lights and then use that as your set point.

Cheers,
Rick.
#3
29-11-2018, 10:38 PM
 Eris Registered User Join Date: Mar 2007 Location: Mount Barker SA Posts: 68
So if -20C can be reached in both dark and light frames ambient temperature at the time both images are taken is irrelevant?
#4
29-11-2018, 11:07 PM
 brisen (Brian) Registered User Join Date: Aug 2013 Location: Caboolture, Australia Posts: 188
Quote:
 Originally Posted by Eris So if -20C can be reached in both dark and light frames ambient temperature at the time both images are taken is irrelevant?
Correct. As long as the sensor temp is consistent between both lights and darks the ambient temperature is of no consequence. It just means you won’t need to use as much of the cooking power to get to the set temp.

Brian
#5
29-11-2018, 11:44 PM
 Eris Registered User Join Date: Mar 2007 Location: Mount Barker SA Posts: 68
Great!
Thanks for your help guys.

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