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?
|Thunderheads With Egret by Buzz Lightyear|
|Double Rainbow; Abiquiu, NM, USA. by abiquiuense|
from After the Rain