Agisoft Metashape > Camera Calibration

Negativ Focal Lengt - Fisheye

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sven09:
Hello,
i am playing with Camera Calibration and iam not shure if the calibration is correct.
I tried a gopro hero 4 silver and a xiaomi yi 2k with different photo sets (5-60) and i always get an negativ focal lenght.
Is this normal for an fisheye camera?

And my second question xiaomi yi offers a "Lens Rectification" mode, which turns off the fisheye effect.
If i use this mode should i use frame or fisheye mode? I am not sure because there is also a light fisheye effect left.
I attached one calibration photo with fisheye off.

Thanks for support
Sven

Alexey Pasumansky:
Hello Sven,

Usually we do not recommend to apply geometrical transformations to the images before processing.

This particular image looks to be still fisheye, but I suggest to process the original images anyway.  If you are still getting negative focal length, please send the .lnz project file and source photos to support@agisoft.com.

sven09:
Thanks Alexey,
I have tried with standart fisheye images and sometimes its work and sometimes i get negative focal lenght.
I have a photo set with 19 images but i dont know if the result is accurate.
Send you a mail, hope you can help me, maybe my photos are just bad.

Alexey Pasumansky:
Hello Sven,

In your project the focal length seems to have adequate value.

But are these images already modified or these are originals?

sven09:
The photos in my mail are without modifications.
Should i make more photos to verife my calibration file?
I am not shure how accurate the calibration should be, should i focus on an accurate calibration or arent there big differences?

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