Hallöchen!
[I corrected the language in my last sentence in the quotation.]
Fabien Castan writes:
>>> If we use a checkerboard for calibration, we compute both the
>>> focal length and the distortion, so the result will be correct
>>> because this relationship is independent from the focus.
>>
>
>
> > If we use a checkerboard for calibration, we compute both the
> > focal length and the distortion, so the result will be correct
> > because this relationship is independent from the focus.
>
> If I understand you correctly, you assume that a lens at 200mm
> nominal and close focus, which act
Hallöchen!
Fabien Castan writes:
> [...]
>
> The focus has an impact on the focal length. I guess that the
> metadata from the camera doesn't take the focus into account.
At least for Nikon, it doesn't. Probably neither for any other
vendor.
> On the camera device, it's just a mechanical recor
> > When you are doing the calibration do you also compute the focal
> > value?
> Do you mean focal distance or focal length?
>
focal length
> Or do you use directly the metadata information and only compute
> > the distortion?
> I use from the metadata the camera model (sensor size), lens model,
