So far as I can tell, the lens does not move in and out for zooming, so there seems to be no danger of dust being sucked in, a problem with some zoom lenses. The lens specs are impressive....a 10-element design according to Asus: http://www.asus.com/Phones/ZenFone_Zoom_ZX550/
I am very curious as to how well the camera performs in low light while using the dual LED flash. Surely a xenon flash would have made a considerable difference in lighting.