Re: Sickening amount of dust in 5D image

"Mark²" <mjmorgan(lowest even number here)@cox..net> wrote in
news:1E37i.396422$g24.286295@xxxxxxxxxxxx:

That's certainly a posible contributor. The 100-400 IS L comes to
mind, with its push-pull design, though I used that lens on my D30 for
several years and never had a dust problem.

The air exchanges mostly through the lens itself and the outside world.
Dust accumulates in the lens, but I haven't seen any evidence that it pumps
air into the body to any degree. How much air would go through the body,
if it could escape through some other means?

I always have a 1.4x TC on my cameras with the 100-400, and the 20D and my
new 30D both collect garbage on the sensor very quickly - but it seems that
most of this garbage is generated by the camera itself, IME.

The 400D is the first Canon DSLR designed not to grind itself.



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John P Sheehy <JPS@xxxxxxx>
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