On dimanche 26 mars 2017 13:23:52 CEST Alex Delaforce wrote:
> Hi,
>
> This is a Darktable question not a camera question.
>
> I get dark corners and reports of 8mm focal length with this compact.
> Should I get a different camera for use with DT or is there something I
> can do to fix this. I use DT with Ubuntu.
>
> I use DT with my canon 6D with great results. I wanted a compact to
> carry when I don't want all my kit with me.
>
> I really don't want to have to use Lightroom or the Canon DPP software
> as I love DT
>
> Any advice gratefully received
>
The camera itself is marked 8.8-36.8mm focal length, so that's more or less as
expected. The
24-100 mm cited in some tests is the equivalent for 35mm cameras, and related
to the sensor
size. Note that DT reads the focal length information from the EXIF data in the
image file.
Vignetting is often a bit of a problem with zooms, but can be corrected in DT.
If there's a correction profile available for the lens, such corrections can
even be done semi-
automatically.
But, while the *camera* has been added to the Lensfun database, but *lens*
correction data
aren't available (so far). You might try using the profiles for the Canon g7x
('Mk I'). You can
also try to generate the correction profiles yourself, there are tutorials for
this on the web. This
is easy enough for distortion, less so for vignetting, but in this case, the
distortion correction
seems to solve a large part of the vignetting problem:
http://www.imaging-resource.com/PRODS/canon-g7x-ii/canon-g7x-iiA4.HTM
Hope this helps,
Remco
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