Attached Link: http://epaperpress.com/ptlens/

PTLens is a free plug in that will correct the distortion for you. If you have Photoshop it will do everything fully automatically from the EXIF data held in the image, if you use Paint Shop Pro then it requires you to set the type of camera used and lens zoom used.

And every one said, 'If we only live,
We too will go to sea in a Sieve,---
To the hills of the Chankly Bore!'
Far and few, far and few, Are the lands where the Jumblies live;
Their heads are green, and their hands are blue, And they went to sea in a Sieve.

Edward Lear
http://www.nonsenselit.org/Lear/ns/jumblies.html