This whole static thing definitely raises a lot of questions in my mind...
Unless the AA filter were coated with something conductive, they would not
be able to bleed the charge off of it.
If I walk across a floor and develop a static charge, that charge will be
transfered to anything I'm holding that is conductive. Perhaps most of the
camera becomes charged while the AA filter remains neutral until air, a
brush, or something transfers charge from/to it.
The ion generaters create the ions by developing a very stong electrical
field at the sharp point. There has to be another opposite charge somewhere.
The somewhere else is generally much broader and doesn't develop an intense
local field. One of the links mentioned creating a coulomb of charge. That
is a lot of charge. C=Q/V or Q=CV = 100e-6 * 300v = 0.03 coulombs on a 100uf
capacitor that has 300v across it. A flash might have more capacitance than
this but high voltage capacitors are large. That amount of charge on the ion
generator comes from the very high voltage but it surprises me.
When you pull a record out of its jacket the movement causes charge to be
split between the jacket and the record leaving each with a static charge. I
don't see anything similar happening with the AA filter.
-jeff
----Original Message Follows----
From: Winsor Crosby <wincros@xxxxxxxxxxx>
That is where I have a problem with the static electricity theory of
sensor dust. Of course the sensor is grounded and protected from
static electricity. The AA filter is attached at least to the frame
of the sensor. It is hard for me to imagine that a camera
manufacturer would take pains to insulate the AA filter in its
attachment so that the sensor grounding would not also bleed off any
charge on the filter. It also seems to be that the maker is just as
concerned about dust as the customer and their engineers are bright
enough to consider and neutralize any effects of static charge.
Winsor
Long Beach, California, USA
On May 16, 2006, at 11:19 AM, Moose wrote:
> I do know that nothing bad happened to the camera, as I've used it for
> months since then with no change in results. I can't imagine that
> blowing a few ions in to reduce static charge on the AA filter in
> front
> of a properly wired and grounded sensor could have any effect at
> all on
> sensor/circuitry. Proper static control is a necessary part of all
> digital circuitry.
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