https://bugs.kde.org/show_bug.cgi?id=439221
Jasem Mutlaq changed:
What|Removed |Added
Resolution|--- |FIXED
Version Fixed In|
https://bugs.kde.org/show_bug.cgi?id=439221
--- Comment #15 from Jasem Mutlaq ---
Yes thanks, I already figured it out. It should be fixed in 3.6.1
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Objet : [kstars] [Bug 439221] Incorrect calculation of camera field of view
https://bugs.kde.org/show_bug.cgi?id=439221
--- Comment #13 from Jasem Mutlaq ---
I'm about to add support for this in Ekos but the math doesn't check out.
For your camera, this would be
fov_w
https://bugs.kde.org/show_bug.cgi?id=439221
--- Comment #13 from Jasem Mutlaq ---
I'm about to add support for this in Ekos but the math doesn't check out.
For your camera, this would be
fov_w = 6875.5*atan(6240*5.67 / (2000*24)) = 250226.44 arcsecs
which is 69.5 degrees. While you say it
https://bugs.kde.org/show_bug.cgi?id=439221
--- Comment #12 from Jasem Mutlaq ---
So if we can add a test to see which method is used to calculate. However, for
the camera lens, there aren't information for that available in Ekos right now.
It just has access to focal length and aperture.
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https://bugs.kde.org/show_bug.cgi?id=439221
Nate Graham changed:
What|Removed |Added
CC||n...@kde.org
--- Comment #11 from Nate Graham
https://bugs.kde.org/show_bug.cgi?id=439221
--- Comment #10 from Fred ---
Apparently the pixel size is in um (10^-6 m) and the focal length is in mm
(10^-3 m), therefore the full formula is :
// FOV in arcmins
double fov_x = 6875.5 * atan( ui->cameraWidth->value() *
https://bugs.kde.org/show_bug.cgi?id=439221
--- Comment #9 from Fred ---
I forgot to say that you just have to check if all units are consistent !!!
The pixel width and focal length shall be expressed in the same unit (both in
mm, or both in inch, or both in m…).
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https://bugs.kde.org/show_bug.cgi?id=439221
--- Comment #8 from Fred ---
Jasem the bug fix is in fovdialog.cpp replace the lines :
// FOV in arcmins
double fov_x = 206264.8062470963552 * ui->cameraWidth->value() *
ui->cameraPixelSizeW->value() / 6.0 / ui->TLength2->value();
double fov_y =
https://bugs.kde.org/show_bug.cgi?id=439221
--- Comment #7 from Fred ---
This formula is valid for all optical equipment, from lenses to telescopes,
focused at infinity, which is the general use in astrophoto. It doesn’t work
with fisheyes and at macro/proxy focus (macro photo) but we rarely
https://bugs.kde.org/show_bug.cgi?id=439221
--- Comment #6 from Fred ---
You can have it differently. Just multiply the pixel size by the number of
pixels and you get the sensor’s dimension.
The formula becomes :
- fov(width)=2*atan(P*Nw/(2F))
- fov(height)=2*atan(P*Nh/(2F))
Where P is the
https://bugs.kde.org/show_bug.cgi?id=439221
Jasem Mutlaq changed:
What|Removed |Added
Ever confirmed|0 |1
Status|REPORTED
https://bugs.kde.org/show_bug.cgi?id=439221
--- Comment #4 from Fred ---
… and of course F is the focal length of the optical system.
L and F shall be expressed in the same unit.
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https://bugs.kde.org/show_bug.cgi?id=439221
--- Comment #3 from Fred ---
Hi!
L is a length of the active region of the sensor. Whether the width, the height
or the diagonal.
Fred
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https://bugs.kde.org/show_bug.cgi?id=439221
--- Comment #2 from Jasem Mutlaq ---
Thank you for the report. What's L?
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https://bugs.kde.org/show_bug.cgi?id=439221
--- Comment #1 from Fred ---
More details here :
https://www.webastro.net/forums/topic/192785-fiabilité-calcul-champ/?tab=comments#comment-2897344
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