Learn how to use the Digital Lens Optimizer feature in Digital Photo Professional version 4.x which allows you to use lens data to correct diffraction errors in your images.
EOS MOVIE Plugin-E1 for Final Cut Pro 1.5: The EOS Digital Rebel Series cameras are not compatible with EOS MOVIE Plugin-E1 for Final Cut Pro. The following software must be installed on the PC - Final Cut Pro 6.0.6 - Final Cut Pro 7.0.3 and later NOTE: Final Cut Pro X is NOT supported by this plugin.
Even when the tilt is corrected, there may be a margin of error of ±1°. If the camera is very tilted, the electronic level's margin of error will be bigger.