On Sat, Mar 30, 2013 at 11:24 PM, Leonard Evens
<[email protected]>wrote:
> On Sat, 2013-03-30 at 22:27 +0100, Pascal de Bruijn wrote:
> > On Sat, Mar 30, 2013 at 9:52 PM, Leonard Evens
> > <[email protected]> wrote:
> > On Sat, 2013-03-09 at 12:30 +0100, Pascal de Bruijn wrote:
> > > On Sat, Mar 9, 2013 at 12:56 AM, Leonard Evens
> > > <[email protected]> wrote:
> > > > I recently got a Nikon D800, and I am having problems with
> > lens
> > > > correction.
> > > >
> > > > I've used it with two lenses.
> > > >
> > > > It recognizes the 24-70 mm lens from the exif information,
> > but it
> > > > doesn't allow me to then select that lens, which, I've
> > found, is
> > > > necessary for lens correction to work.
> > >
> > > The lens isn't automatically selected? Possibly this happens
> > because
> > > of a naming mismatch between Exiv2 and Lensfun? Are you sure
> > the 24-70
> > > available in Lensfun is actually the lens you have? Some
> > lenses have
> > > incompatible variations...
> >
> >
> > I'm not sure what you mean here.
> >
> >
> > For many manufacturers there are lenses that are named in nearly
> > identical ways, but they are not truly the same lens...
>
> As far as I can tell there is exactly one Nikkor 24-70 mm lens. Its
> full description is
> AF-S NIKKOR 24-70mm f/2.8G ED
> exiv2 -pt returns
> Nikon AF-S Zoom-Nikkor 24-70mm f/2.8G ED
>
Yep, that should be the same one... But I sorta already guessed as much,
which is why I said to ignore it...
> and that is what darktable shows in the Exif data. It is also what the
> lens correction module shows.
>
> I don't think there is any doubt that I have the right lens.
>
> By the way, I haven't been able to find the Lensfun database of lenses
> it covers.
>
Right. I don't think it does.
As I said, this article has some links on how you can generate a correction
model for it:
http://www.darktable.org/2012/10/whats-involved-with-adding-support-for-new-cameras/
I highly recommend reading all three links before doing anything. Also
getting good shots can be hard. If I recall correctly, I just sent a print
containing black-on-white 3:2 rectangles in increasing sizes to a local
print shop, to be print on a sheet of A2 paper, which I stuck to some
foamboard to keep it straight. This seemed a more reliable approach than
using some architecture for the straight lines.
Regards,
Pascal de Bruijn
PS: Please try to keep on-list :)
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