>>> [email protected] writes:
>>>
>>>> Is there in dt something similar to Rawtherapee manual
>>>> correction of concave-convex distortions?  If I take a picture
>>>> of ocean horizon using Nikon 16-85 VR DX at 16 the horizon line
>>>> is showing that the earth is round. :) Lensfun seems can't fix 
>>>> it. 
>>> 
>>> Can you please zip a NEF and upload it at
>>> <http://wilson.bronger.org/calibration>?  Then, I have a look at
>>> it -- because Lenfun should be able to do it. 
>>
>> What, straightening the horizon when it should be curved (from an
>> optical POV)?
>
> I *think* (I haven't seen any pictures yet) that the horizon doesn't
> go through the image centre.  Then, if the distortion is not 
> corrected, it is bent.

Hi Torsten,

I've uploaded the file, the name is very original: test.zip. :) It is from 
Cancun, Mexico. Your guess is correct - the horizontal line is not at the 
center.

Thanks a lot for the help,

Andrew
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