Say Nikon Z 24-70 f 2.8. It has a lens element near the mount which moves as we zoom. This means, air will be pumped into the camera. How will the air exit?
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Weather sealed ≠ airtight.
Check out this video, they explain how air can move into and out of an externally zooming lens with weather sealing at 10:30:
This is a really cool breakdown
Air can move internally in a lens. Moving the lens doesnt change the air volume inside the lens, as it was already in there. With that said lenses arent air tight.