Perhaps dust "free" isn't accurate...but this may be the trick to minimize particles in very dusty/windy environments. Click on photo and scroll to bottom of page.
I'd rather carry a rocket blower in my bag than that thing. From my experience, far more dust enters the camera through dust-sucking zoom lenses (the ones that change physical length) than through changing lenses, though I've never changed lenses in a dust storm. My assumption is this wouldn't help much if the conditions are that rough.
I just finished a location shoot of some vacant land up on a windy hillside today. I changed from my 12-24 to my 24-105 to my 70-210 MULTIPLE times. No problems.
Besides, that's why God invented Photoshop.
Sure, I try to minimize changing when I can, but MOST "dust" on the sensor comes from inside the mirror box anyway.
I got tired of being paranoid. I'm careful, but I don't worry about it,
I agree I wouldn't want to take that into the field, no pun intended! I simply try to avoid changing lenses in bad conditions, another reason why it is good to have a 2nd body. As mentioned, then there is Photoshop!
Unfortunately, when it opens up it will contain the same dust and particle filled air as in the environment outside the chamber. Unless the chamber is fitted with a small particle filter I can't see how it would help. In fact, by slowing down the operation, it would probably make things worse.
Red
nathanlake wrote:
While it might work, I would rather do a bit more planning and avoid the lens changes as much as possible.
Avoid lens changes? Isn't that why we bought SLR's? Anyway, I found that changing lenses in the rain pretty much eliminates any dust issues.
It also helps to use fast lenses and shoot wide open all the time and just pretend the dust isn't there. Using this method I went nearly two years before having to clean the sensor on my MkII. :-)
beerguy wrote:
[He means that no one will want to see your photos anyway so it's a moot point.
Ahhh... I thought he meant that since there are only a few lenses available for the Olympus system that chances are you won't be changing lenses anyway.
Naw, it's the shaking sensor gimmick. No worries, Canon's gotten sucked into that silly idea too.
Honest, the sky is not falling. The last two items on the linked site (I suspect they got p.o.ed at the hotlink to their image & shut that down) are selling to gear collectors. IMHO, silly money wasters.
I simply try to avoid changing lenses in bad conditions, another reason why it is good to have a 2nd body. 
As mentioned, then there is Photoshop!