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Hi,

even if lens correction will only be of real use for me when
http://darktable.org/redmine/issues/8659 has been resolved and lens
correction works in styles like denoise does, there's another major
annoyance, that I always have to select the lens manually for my "old"
Olympus lenses:

> exiftool somename.ORF
[...]
Camera Type 2                   : E-520
[...]
Body Firmware Version           : 1.101
Lens Type                       : Olympus Zuiko Digital ED 14-42mm
F3.5-5.6
[...]
Lens Model                      : OLYMPUS 14-42mm Lens
Lens Firmware Version           : 1.305
[...]

Darktable tries to match the model "OLYMPUS 14-42mm Lens" against
lensfun's <model>-Entry, which obviously should be right, but isn't
working. All would be fine, if a second guess would be made by
comparing the "type" with the <maker>+<model>, at least for old
Olympus cameras.

I get said behaviour for theses tested combinations:

* E-520 / Olympus Zuiko Digital 25mm F2.8
* E-520 / Olympus Zuiko Digital ED 14-42mm F3.5-5.6
* E-520 / Olympus Zuiko Digital ED 40-150mm F4.0-5.6
* E-600 / Olympus Zuiko Digital 25mm F2.8
* E-600 / Olympus Zuiko Digital ED 14-42mm F3.5-5.6
* E-600 / Olympus Zuiko Digital ED 40-150mm F4.0-5.6

(I can provide you with example RAWs, if needed.)

My E-M5 works fine out of the box with different lenses.

So, I *would* suggest a different or copied entry in the lensfun
database, but if the Zuiko Digital 40-150mm f/3.5-4.5 and the Zuiko
Digital ED 40-150mm F4.0-5.6 (of which I have only one) were both
mapped to model "OLYMPUS 40-150mm Lens" in the exif, this wouldn't work.

Therefore: Whose bug is it? Should darktable relax the matching as
suggested above, or should i open a bug report for lensfun?

Take care,
  Jan Niklas
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