[CREATE] [hugin-ptx] Re: Lens correction database

[Pablo d'Angelo]

Hi Arnd,

Arnd Baecker schrieb:
> On Fri, 11 May 2007, Pablo d'Angelo wrote:
> 
> [...]
> 
> 
>> The problem is that the distortion parameters change with the focus. They
>> are different for short distance (as in the test shots) and the far distance
>> (where the camera is usually used).
> 
> Unfortunately, not all cameras store the focus distance in their
> exif. For example for Canon EOS (20D ,300D, 350D, 5D, Digital Rebel XT,
> 1D, 1Ds) see,
>   http://photo.net/bboard/q-and-a-fetch-msg?msg_id=00F5eG
> the Makernote 0x0004: FocusDistanceUpper and FocusDistanceLower
> always show 0.
> 
> Maybe it is still hidden somewhere in the  makernote ...

Yes, EXIF data is not reliable and I think, an automated lookup doesn't work 
in practice (at least for the focus distance).

I guess, we should focus on the far distance parameters, since most images 
are in that category.

ciao
   Pablo