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How to generate a master flat from light frames?  

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(@schullerfred)
Molecular Cloud Customer
Joined: 4 months ago
Posts: 3
April 26, 2019 22:57  

Hi,
sorry if this was already described somewhere, but I couldn't find it... is there a way in APP to generate a master flat using a large number of light frames?

Cheers,

Fred

This topic was modified 2 months ago by SchullerFred

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(@wvreeven)
Main Sequence Star Customer
Joined: 9 months ago
Posts: 38
April 27, 2019 10:30  

Hi Fred,

Yes there is. You need to load all flat subs into APP in the 1) LOAD tab. Then if you have bias and dark frames and/or a master bias or dark, load those as well. In 2) CALIBRATE scroll all the way down and make sure that “create MasterBias, -Dark, -Flat” is ticked. Then click “create Masters and assign to Lights”.

 

HTH, Wouter


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(@schullerfred)
Molecular Cloud Customer
Joined: 4 months ago
Posts: 3
April 29, 2019 09:00  

Hi Wouter,

thanks for your answer. But what I meant is to use light subs (with stars, and nebulae, and everything in) with the hope that taking a large number of them and with some clever averaging, it could be possible to build a flat field.
I usually take dark frames during each session, it's quite easy (simply putting the cap in front of my scope, and using the same settings for the capture as for the light frames); but capturing flat frames is more tricky, since it requires a color neutral uniformly illuminated field...

Fred


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(@wvreeven)
Main Sequence Star Customer
Joined: 9 months ago
Posts: 38
April 29, 2019 10:47  

Hi Fred,

Ah sorry, I misread. To my best of knowledge this is not possible with APP.

 

Wouter


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(@annehouw)
Main Sequence Star Customer
Joined: 2 years ago
Posts: 26
April 29, 2019 19:26  

Hi Fred,

 

Maybe this is what you are looking for?

How to correct a stack for vignetting

 

Regards,

Anne


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