Weather sealing of a size-changing zoom
The 12-35 changes size when zooming, which means that the total volume of the lens+camera (on e.g. a weather sealed body like the E-M5) changes when you zoom, and air presumably is sucked in or pushed out. Does this air get filtered through some moisture/dust filter?
|Common Flashwing by digimania|
from canon dslr
|The Marilyn impersonator by Lee8282|
from Blowing in the Wind (Nature)