Home run distances from 1998-2005 are by the Arizona Diamondbacks. Distances from 2006-present, are by ESPN Stats & Information Group. We're concerned only about D-backs home-runs here, because where's the fun in celebrating opposition homers?. The record by a visitor at Chase is the 485 foot one hit by the Padres' Cameron Maybin off Trevor Cahill on July 2, 2012. That's the only one longer than 473 feet. I wouldn't recommend going full screen on some of these older video; they appear to date from a time before hi-def, and look more like a game of Tetris on extreme difficulty.