Bug 414155 - EKOS produces FITS files with inconsistent values (CDELT1, CDELT2)
Summary: EKOS produces FITS files with inconsistent values (CDELT1, CDELT2)
Status: RESOLVED DOWNSTREAM
Alias: None
Product: kstars
Classification: Applications
Component: general (other bugs)
Version First Reported In: unspecified
Platform: Other Linux
: NOR normal
Target Milestone: ---
Assignee: Jasem Mutlaq
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2019-11-14 21:25 UTC by han.k
Modified: 2019-11-25 10:18 UTC (History)
0 users

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Description han.k 2019-11-14 21:25:26 UTC 
SUMMARY

For FITS files written by EKOS, the header values CDELT1,CDELT2 values don't match up with the focal length and pixel size. See link to image. Same for an other image see forum:

https://indilib.org/forum/ekos/5901-astap-astrometry-integration.html?start=48#45813

From the header:

Focal length 560 mm
Pixel size 3.8 micrometer. Pixel size 1.4 arcsec/pixel equals 0.000391 degrees/pixel
Dimensions 4656 x 3520 => Image size is 1.82 x 1.37 degrees
CDELT1,2 in header 0.000777 degrees/pixel but should be 0.000391 degrees/pixel

What's going wrong ?


image link:
dl.free.fr/getfile.pl?file=/gAfdJ7sV


STEPS TO REPRODUCE
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OBSERVED RESULT


EXPECTED RESULT


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION
Comment 1 Jasem Mutlaq 2019-11-14 22:22:06 UTC 
was this image captured on the guide scope?
Comment 2 Jasem Mutlaq 2019-11-15 08:39:31 UTC 
So this is an issue with INDI, not Ekos/KStars. INDI generates FITS, KStars is just a client.

I *believe* it can happen when users capture in guide scope, but the INDI::CCD still utilizes primary focal length for CDELT calculations.
Comment 3 Jasem Mutlaq 2019-11-25 10:18:21 UTC 
This issue was fixed in INDI. So closing this unless it is KStars related.