https://bugs.kde.org/show_bug.cgi?id=439221
Bug ID: 439221
Summary: Incorrect calculation of camera field of view
Product: kstars
Version: unspecified
Platform: Other
OS: Other
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: mutla...@ikarustech.com
Reporter: fred_...@hotmail.fr
Target Milestone: ---
SUMMARY
The returned value for the camera field of view is wrong when the focal length
is short.
OBSERVED RESULT
- Canon 6D mk II pixel pitch of 5,67 um and 6240x4160 px
- 24 mm lens
Returns : 84,47 x 56.31°
This is completely wrong
EXPECTED RESULT
73,6° x 53,1°
ADDITIONAL INFORMATION
Apparently your logic is to multiply the pixel sampling by the number of
pixels. If this is a good approximation when the focal length is at least 10x
bigger than the sensors size, it completely fails otherwise.
The formula that gives the proper result each time (but fisheyes) is :
fov = 2*atan[L/(2*F)]
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