Hi,

I wanted to use the lensfun database to calculate the camera sensor 
sizes, however I'm not sure this is possible.

First, just looking at the <camera> elements, I see that they don't 
contain the sensor aspect ratio which would be necessary. The <lens> 
entries however have them but I guess this just refers to the image 
aspect ratio used for calibration.

This brings me to another point: Why are the <cropfactor> and 
<aspect-ratio> elements within <lens> not part of the <calibration> 
element? To me this would make more sense, as these things aren't 
properties of the lens itself, right?

Thanks for advice,
Maik



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