List here your camera
The Pentax shows minor barrel distortion at the widest side, so I have to correct for this a bit. Here's an example from 15 images (3 mpix each) from the Pentax. It's ~ 370 degrees by 45 degrees
The Canon 20D takes huge images (8 MPix) and thus the processing time and computer hardware requirements are a lot more (research papers).
Jeff 12:18, 10 Dec 2004 (EST)