Re: [Gimp-user] GimpLensfun database

On Sat, Sep 28, 2013 at 6:35 PM, Leonard Evens <len math northwestern edu>wrote:

On Sat, 2013-09-28 at 17:57 -0400, Partha Bagchi wrote:
Here is something you can try. Copy the lens database from svn: and put it the
appropriate location within lensfun-0.2.7. Rebuild lensfun and you
should have the D800 with 24-70.

Thank you.  I may try that.  But I don't really understand why it should
be that hard.  Presumably, the program darktable and the gimp filter
gimplensfun are looking somewhere to find correction information.  If it
is not in /usr/share/lensfun, where in the world is it?

It is in /usr/share/lensfun. It's just not up to date compared to the
database in svn. Cameras and lenses are constantly changing as you know. :)

Personally, I think you should fix lens distortion (if any) within
your raw editor rather than in Gimp, but that's me. :)

I ordinarily work in darktable on NEF fiiles, but I somehow managed to
nuke a whole bunch of NEF images and had to instead work with the jpeg
images on my backup card.

OK, Have you thought about CNX2 unless you are Linux all the way?

BTW, curious where did you read that the 24-70 is the "standard" lens
for the D800? I have never heard of the D800 being sold with the 24-70
as a kit lens (or any lens for that matter).

It is perhaps an exaggeration to call these "the" standard lenses for
the d800.  When I was contemplating laying out a fortune for my D800,  I
posted a query at Nikonians about which lenses I should consider given
my needs.  The 24-70 and 70-200 lenses were both strongly recommended by
several people.  Also, my Calumet salesman recommended those same
lenses.   I think these lenses are common choices for use with the D800.
They should definitely be in the Lensfun database, and if my reference
above makes any sense, they are, so I am perplexed about why I can't
find them.

Yes, that's what I thought you meant. I don't disagree with you. I was
commenting on your statement about the 24-70 being the standard on a D800.
Don't get me wrong. I think the D800 deserves the 24-70. That is in fact
one of my camera/lens combination. :)

Fortunately, my lenses have very little distortions, so I may be able to
avoid using corrections.

Unless you are shooting at 24 2.8, I would not worry about it. Of course,
if you are planning to make a large print then you might want to reconsider
shooting the picture again if possible.

The 14-24 lens was also recommended, but I didn't think I needed it, and
I had already spent enough money.  Later I got a 24 mm tilt-shift
Rokinon lens which was something of a bargain for under $1,000.

try the sigma 10-20. You may be surprised.

Perhaps I should explain that I have been doing view camera 4 x 5
photography with 75 mm, 90 mm, 150 mm and 300 mm lenses.   I wanted the
Nikon D800 to cover roughly that range.  24 mm is relatively short for
35 mm but not as short as 75 mm is for 4 x 5, so someday I may get a
shorter lens for my D800.   One of my interests is architectural
photography, and my 75 mm lens wasn't even short enough to photograph a
building facade from across the street.   I had to stitch two images
using hugin to capture that scene.   I think I can do the same thing
easily, if the need arises, using 24 mm on my D800,

If I feel a pressing need, I may get a shorter focal length lens for the
D800, but given that I am 80 years old, that need may never arise.

Leonard Evens len math northwestern edu
Professor Emeritus, Department of Mathematics, Northwestern University

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