Blank Master Flat a...
 
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Blank Master Flat after calibrating


(@davloose)
Brown Dwarf Customer
Joined: 8 months ago
Posts: 12
Topic starter  

I took Darks, Flats, DarkFlats and Bias frames yesterday, and loaded them up and ran calibration against them, following the workflow in the videos here.  Darks, DarkFlat and Bias all resulted in Masters that looked as one would expect, a smoothed version of the subs. 

However, the Master Flat was basically black, even with various stretching in APP or other viewers.  I redid all the flat subs again tonight, very carefully (wizard in Nina).  They all look as one would expect, dull grey with some vignetting at the corners.  Calibrated in APP, and the result is all black again!  Hovering over the image in the viewer, appears RGB values are all 01638.

Any ideas?? Thanks!

-David

image

 


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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4736
 

From the screenshot I can see you took the flats at 0.15 seconds, at least that is something you want to bring up to 1-2 seconds. How does a single flat look like and what are your gain and offset values?


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(@davloose)
Brown Dwarf Customer
Joined: 8 months ago
Posts: 12
Topic starter  

I did find my problem, I accidentally created my DarkFlats with the same pictures... hence when calibrated they normalized to nothing!


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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4736
 

Excellent, that is good to know! 🙂


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