Am Tue, 22 May 2018 10:03:35 -0400
schrieb Šarūnas <[email protected]>:

> On 2018-05-21 15:50, Аl Воgnеr wrote:
> > Am Mon, 21 May 2018 14:41:41 -0400
> > schrieb Šarūnas <[email protected]>:  
> >> There is no correction data for Sigma 70-300mm F4-5.6 DG OS on a
> >> "full-frame" sensor in lensfun (not in github calibration
> >> repository).  
> > 
> > Yes, and therefore I added a line:
> > 
> >     <lens>
> >         <maker>Sigma</maker>
> >         <model>Sigma 70-300mm f/4-5.6 DG Macro</model>  
> 
> If I understand this correctly, the matching will still be done for
> the above line. The only thing that the lang line does is change the
> display name of the matched lens for given locale...
> 
> >     <model lang="en">Sigma 70-300mm F4-5.6 DG OS</model>  

Sorry, if I write "maybe". If I do this the correction works, otherwise
not.

> The only way to have a lens alias for an optically identical one is to
> duplicate the entire <lens> element and then change the <model> in it.

Not sure, I discussed this already in the lensfun-list. It should, but
my experience is, that the "trick" with <model lang="en"> helped very
often, but not always.

> If you'd like to have that, you should probably raise an issue on
> github/lensfun, which is used for the correction database maintenance.

This thread was originally started as crossposting to the lensfun-list
and the lensfun people have subscribed the list. If I am pretty sure,
that it is correct, what I am writing and if I detect a bug, I will
send them a mail of course.

In the meantime I have some lenses corrected, which did not work
before. I do not use "update" anymore and then it works in
~/.local/share/lensfun if I do not use a version. I decided to create an
own file there for every lens which doesn't work. I am still fighting
with the Pentax DFA 24-70. It doesn't help to use the correction file
from 16.04 (which worked). My next step will be a local exiv2-info-file.

Al

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