"The shutter mechanism on the EOS 50D remains unchanged from the EOS 40D, providing a
rated life up to 100,000 shots and shutter speeds from 30 sec. to 1/8000 sec., with a maximum
X-sync for flash at 1/250 sec. The shutter mechanism on the EOS 5D Mark II is newly
designed, with an integrated shutter-cocking unit and an
extended rating up to 150,000 shots. It also features shutter speeds
from 30 sec. to 1/8000 sec., with a maximum X-sync for flash
at 1/200 sec."
Rated life up to to nie to samo co guaranteed at least, stąd pewnie nieporozumienia u krążące w sieci legendy ludowe.