If anything, I bet it'll be a reverse polarity electrostatic charge
dumped onto the filter/glass/etc.(whatever is protecting the CCD)
and then require some sort of vacuum purge to remove the dust
zapped off the "glass". A real kludge, if ever there was one. Or
maybe instead of vacuum they could place an anode, or anodes,
somewhere near the CCD and cause it to attract the dust
directly.(think electrostatic air cleaner) I do wonder if it could
be done in close proximity to the rest of the electronics without
causing havoc? What kind of power requirements would it have even
if it only had to be turned on when a lens was removed, and
wouldn't it effectively suck dust into the camera while
operating... Lots of problems to overcome.
Might even require a VERY light coating of a metallic compound on
the anti-aliasing/IR element and would probably also play hell with
the angle of incidence of whatever light is trying to get through
the glass.(which is probably why they don't just use glass... it
rtefracts.
) Maybe that's why they don't have anything out to do
it yet?
I'm VERY sure that at least some of their engineers are smarter
than we jackleg engineers.
Just as a final thought, wouldn't it be much simpler if they could
use one permanently installed final lens element on the camera and
leave the final element off the lenses? Probably a lot easier to
clean a lens that doesn't electrostatically attract dust than a CCD
that does...
Or just continue to provide very good lenses like
the E-10 add-ons?
actually most of the dust isnt on the CCD anyway
If it is on the CCD it would be pretty much dark balck and not blurry
Most dust problems are from dust on either an IR or AA filter in
front of the CCD
It doesnt really matter how much protection you put on there will
always be that last layer that can have dust on. And of course a
piece of glass would be easier to clean but if you think about the
size we are talking about it is rather hard for somebody at home to
get something clean especially when you operate in a normal
environment that has dust in the air. It may be clean the moment
after you clean but the first time the mirror flips it will move
anything around that is inside the camera.
I think you see the solution isnt easy if you want interchangeable
lenses. One day there will be a solution to this and i could bet
that as we speak there are lots of engineers ripping their hair out
to try and find a good solution to this.
Mike
I really don't understand this dust problem at all. Sure, I've
seen the nice fuzzy circles on pictures I've downloaded (which I
assume are dust particles) and I know a charged device (ie. CCD)
will attract dust (is it less with CMOS?), but what I don't get
is...
Why can't you just put a piece of transparent optical glass in front?
Yours, confuzed...
Excal
