> Currently, we are storing the diagonal (represented by the
>> cropfactor).  Since the image itself provides the aspect ratio, this
>> also provides the sensor width.
>>
>
> Ok, I will use that!
>

It's not really good, because it creates some rounding error.
It could be great to record the raw value directly.

But I plan to extend this information because some cameras are able
>> to operate in different modes (resolutions, aspect ratios).
>>
>
> Great!
>

Yes, I have many image ratio which doesn't match the sensor ratio and there
is no way to know that. So I can't use it.

It could be really nice to extend the information provided by lensfun with
all the raw camera characteristics.
Maybe a collaboration with the impressive effort of http://www.digicamdb.com
?
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