My nikon D5100 blow air from viewfinder
i've recently bought a new Nikon D5100 camera with 18-105 vr kit len and i've noticed that when going down with the zoom ring, also from 35 to 18 mm, air blows through the viewfinder to my eye. Somebody found the same problem? The vendor replaced initially a camera with another, that has the same, identical problem. Maybe it's a problem related to quality building? It's strange that Nikon make a similar mistake.
this is a usual issue with zoom lenses, due to the extension of the lens/ the movement of the optical elements, air will move inside the camera and as the air doesn't compress itself much, it takes the most easy way out and as the mount is screwed fast, the viewfinder is the easiest way out. This happen to every brand and does only depend on how much the lens extends, for example with the Canon 28 300 L there is pretty much air movement.