Does anyone know of any tool in GIMP I can use to fix "convergence" in photos I've taken?

[ScotchBright]

Convergence is the tendency of pictures to look "flared
upwards" at the side edges of the photo. It's a natural phenomenon
that affects some cameras more than others.
Currently I use a Nikon D3000 with the 18-55mm VR kit lens.
Most pix look great, and on many you'd never know that convergence was
an issue with the camera, but some... particularly night shots
involving fairly tall buildings at a distance which appear at the
sides of a photo make it appear that the buildings are leaning inward
slightly.
I know that some lens manufacturers have software you can
download that fixes this problem nicely, but I like to do things with
graphics software more often than not, so I was wondering if anyone
knew of a tool or plug-in in GIMP that would allow me to fix this.

[John K. Herreshoff]

ScotchBright wrote:

That's just a 'wide-angle' side-effect, and will happen when you've got the
wide-angle cranked toward maximum (minimum focal length). I don't know
about gimp tools to fix it, because I've never run into the problem, but I'd
browse the gimp help to see what you could find. It's a well-known issue,
and has been long before I used cameras for real back in the early 1960s...
Or just get yourself a nice 4x5 view camera and adjust the tilts until the
problem goes away... (Remember Mathew Brady?)

John.

--
Using the Cubic at home.

[Mike Clarke]

Try Filters | Distorts | Lens Distortion from the Gimp menu.
<http://docs.gimp.org/en/plug-in-lens-distortion.html>

--
Mike Clarke

[John W Kennedy]

Or get a tilt-and-shift SLR lens. I know Canon has a few.

--
John W Kennedy
"The grand art mastered the thudding hammer of Thor
And the heart of our lord Taliessin determined the war."
-- Charles Williams. "Mount Badon"