MT Shooter wrote:
Its biggest drawback is all the crap that falls inside the (always up pointing) empty hole. You would always need to keep a body cap on it to prevent all that crap from falling into a lens when it is rotated into the down position. Its just another " not well thought out" gimmick to get a handfull of your hard earned dollars.
It's designed so you don't have to carry the body caps with you. The "empty hole" is meant to be covered by the lens cap of the active lens.
Wish I had known about this a few weeks ago, before I dropped and ruined a 24-70 f/2.8. The $170 "gimmick" may have saved me the $1,700 replacement cost of the broken lens.