hello, welcome to clubsnap. i dont know if u really know or not but there is one intepretation among the many of the jedi terminology:
canon paints their telephoto lenses WHITE. so people jokingly refer to a canon user as: "welcome to the light side"
the main rival, nikon, doesnot paint their telephoto lenses white. they remain BLACK. so people jokingly refer to nikon user as" welcome to the DARK side"
a bit of history(i hope i got the facts right): when canon decided to trash their FD system and start all over anew with their EOS system back in 1988, many were sceptical. at that time, most pros were using nikons, and mostly still manual focus. when canon came out with EOS, ther main draw was USM. very soon, it caught up. records showed that many pros defected from nikons and started to endorse EOS, especially sports photogs. the ever familiar scene of a sea of WHITE lenses swarming at big events was born then.