Thats a perfectly valid point to the robustness and reliability of this particular device. All of those little pieces, yikes. I for one just cram my 70+mm lenscaps in my back pocket or they just get pulled off in my thinktank bag when I'm getting the camera out. Lens hoods stay at home, too clunky.so if one of the "blades" is half open cause you incidentally bumped into an obstacle or pushed while hanging of your shoulder... you cannot notice this in your veiwfinder. right? A rhetorical question. outcomes: corner vignetting, diminished exposure. Happened to me a lot with some lenshoods not being attached properly in the past.