Anyone who has ever lost a lens cap, or the permanent removal and replacement of such dates back to the lens on the cookie, this principle is like. It also works reliably and opens when turning the camera. Material is plastic. In this respect, it can be assumed that the production value thus the price is reasonably low and actually overpriced completely. You pay therefore for the idea. But - you knew that beforehand what the thing costs and have to decide whether it's worth one, meet before buying. If the finding that it does its job as intended. Despite a star deduction for the hefty price tag.
