Re: Air coming through lens?
- From: "Neil Harrington" <not@xxxxxxxxxx>
- Date: Mon, 3 Sep 2007 21:33:50 -0400
"RichA" <rander3127@xxxxxxxxx> wrote in message
news:1188844543.180543.259500@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On Aug 31, 2:23 pm, middleli...@xxxxxxxxxxxxxx wrote:
Hi
I've just purchased a Nikon 18-200mm VR lens for my D40. Rushed home
from work tonight, fitted it to the camera body, and have been having
fun testing it out. So far I'm very impressed with it - especially
the VR - and it's going to allow me to do much more than the 18-55mm
kit lens it replaces. One thing I've noticed, however, is that as I
zoom the lens in and out I can feel a definite current of air blowing
into my eye through the viewfinder. Is this normal? I never noticed
it on my 18-55, but that obviously has a much smaller zoom than the
18-200. Should I be overly concerned about this (I'm thinking in
terms of dust entering the camera), or is it just something to expect
with a lens of this range?
Cheers.
I'd be concerned. If the bellows action is sucking dusty air into the
body/lens, you are bound to see more end up on screen. Guess it's a
good thing Nikon has adopted an anti-dust system (finally) so lets
hope it works.
Anti-dust systems in the camera can only move the dust around inside the
camera, as far as I can see. Eventually the same dust is probably going to
get back on the sensor, or more correctly the anti-aliasing filter over the
sensor.
This kind of thing is a definite concern, anyone who has looked into a
computer that has been working for a while can see why, dust build-
up.
But that's entirely different. With a computer you have at least one (and
usually more) fans pulling air through the system, and it generally comes in
at about floor level. And the fan(s) do that constantly, all the time it is
running. A computer is a natural dust-sucking and interior-dust-coating
machine.
On a sensor with pixels the size of blood cells, it doesn't take
much to show up in images.
It may take quite a bit, actually, except at small apertures that bring the
AA filter closer to being in focus.
Neil
.
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