Attached Link: http://www.milamberart.com

Unless you change the dimensions that you render to the screen (i.e. you render to a 400x100 widescreen image), the preview thumbnail should match the rendered document pretty closely. What is different about the preview and the actual render? As for the apparent deformation- that's because of the camera's Field of View- you can adjust it by clicking one of the little sphere controls around the trackball. Note that the sphere isn't deformed, but the camera's projection changes it. Tweak the FOV and you should be able to make stuff at the edges look more better :-)