Master Flat - Does ...
 
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Mar 28 2026 APP 2.0.0-beta40 will be released in 7 days.

It did take a long time to have the work finished on this and it  will have a major performance boost of 30-50% over 2.0.0-beta39 from calibration to integration. We extensively optimized many critical parts of APP. All has been tested to guarantee correct optimizations. Drizzle and image resampling is much faster for instance, those modules have been completely rewritten. Much less memory usage. LNC 2.0 will be released which works much better and faster than LNC in it's current state. And more, all will be added to the release notes in the coming weeks...

Update on the 2.0.0 release & the full manual

We are getting close to the 2.0.0 stable release and the full manual. The manual will soon become available on the website and also in PDF format. Both versions will be identical and once released, will start to follow the APP release cycle and thus will stay up-to-date to the latest APP version.

Once 2.0.0 is released, the price for APP will increase. Owner's license holders will not need to pay an upgrade fee to use 2.0.0, neither do Renter's license holders.

 

Master Flat - Does Dark Exposure Time Matter?

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(@rdricks)
White Dwarf
Joined: 7 years ago
Posts: 7
Topic starter  

Here is the situation.  I am using a DSLR and have several Master Dark files saved at various  exposures (ISO 3200 30s, 60s, 90s, 120s, 180s, etc).  When I shoot a session I will typically have 2 sets of lights the next morning, say 90s and 120s.  I then take my flat frames.

When I pull in the files to make my Master Flat I use my Master Bias and BPM.  Do I need to make 2 master flat files - one with the 90s Master Dark and one with the 120s Master Dark, or do I create I master flat?  (And if 1 master flat, which master dark is the best to use)?

 

-Ryan



   
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(@Anonymous 174)
Joined: 9 years ago
Posts: 5702
 

A flat is just there to correct vignetting and dust, a master bias or dark flat is what is needed, darks are not used for that. If you have all masters created automatically from the various frames, APP will automatically use the correct ones for each process.



   
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(@rdricks)
White Dwarf
Joined: 7 years ago
Posts: 7
Topic starter  

Thank you for the explanation Vincent. Very helpful. 



   
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