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Reduce the impact of flats?  

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(@sternefueralle)
Brown Dwarf Customer
Joined: 4 months ago
Posts: 7
January 14, 2021 15:01  

Hi everybody,

I would like to reduce the impact of the flats to my stacked image.

As you see the mild yello circle in the middle of the stacked image comes from the flat.

DeepSkyStacker is stacking these data in a more "mild" way, so that I can say that it would be very helpful to reduce the intensity of the flat correction.

Is there a way to reduce the "influence" of the flats?

Thank you and

greetings from Peter

Image4

 


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(@wvreeven)
Galaxy Admin
Joined: 2 years ago
Posts: 584
January 14, 2021 19:32  

@sternefueralle There is no way to influence the way the flats are applied to the lights in APP. I am afraid that if you get such artifacts after applying the flats, that the flats are open for improvement. So you may want to review the way you take the flats in order to get rid of this effect.


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(@sternefueralle)
Brown Dwarf Customer
Joined: 4 months ago
Posts: 7
January 15, 2021 16:15  

@wvreeven Thank you for your answer. I worked it out and found an improvement, that helps me with my flats...sorra, it's my fault. CU


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(@wvreeven)
Galaxy Admin
Joined: 2 years ago
Posts: 584
January 15, 2021 16:47  

@sternefueralle Out of sheer curiosity, what was it?


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(@sternefueralle)
Brown Dwarf Customer
Joined: 4 months ago
Posts: 7
January 15, 2021 17:09  

I made new flats with an exposure time around 4.6 secs and added dark flats for the first time. Now the master flat is more equal. Not so intense... this works. 


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(@wvreeven)
Galaxy Admin
Joined: 2 years ago
Posts: 584
January 15, 2021 17:22  

@sternefueralle Yes, creating proper flats and using dark flats or bias frames to calibrate them is the preferred way. In my experience dark flats work better with modern CMOS cameras. Glad to read that you sorted out this issue.


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(@sternefueralle)
Brown Dwarf Customer
Joined: 4 months ago
Posts: 7
January 15, 2021 17:35  

It is strange, that this occurred suddenly. The correction frames I usually used worked very fine. But suddenly, I can not really say when, it behaved strange, as I showed. So I was confused and did bout know where the problem comes from, or better, how to solve... happy to have solved another problem in astrophotography...


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