Sensor auto-cleaning, ultrasonic or bust

Savageduck wrote in
news:2010101210562397157-savageduck1@REMOVESPAMmecom:

On 2010-10-12 10:33:57 -0700, RichA said:

On Oct 12, 11:33*am, Savageduck
wrote:
On 2010-10-12 05:55:13 -0700, Bruce said:



Savageduck wrote:
On 2010-10-11 14:40:56 -0700, RichA said:

Pentax is now using the kind of ultrasonic sensor cleaning that
Olympus pioneered in 2003. * The idea that cameras with sensors
unprotected and close to them mouth of the bayonet not having it
is insane. *I never, ever had any dust show up on my Olympus
DSLRs and have only had one incidence of it with the G1, but the
D300 has to be policed for it all the time. *That Sony doesn't
have a good system
on
the NEX is mind-boggling.

That is quite a slight of the D300(s). What evidence and reports
of such prolific sensor dust problems do you have with the
D300(s)? Other than hearsay that is.

Do you actually have the "Dust removal" feature activated? If so,
what setting do you use?
Check your Setup menu & "Clean image sensor" options.

My schooling with sensor dust removal and wet cleaning came with
the D70, which is truly a dust magnet, and remains so. I remain
awash in Eclipse fluid, PEC pads and sensor swabs, none of which
have been needed with my D300s.
After dealing with the D70 I am truly thankful to have a
functioning dust removal system in the D300s. I have mine set to
"Clean at startup & Shutdown" and I have never had to wet clean
either my D300 or D300s, even after changing lenses in windy, dust
filled conditions. One time I detected a piece of fluff through
the viewfinder. That was in the chamber, on the mirror, and that
was taken care of by one on Mr
.
Giotto's handy "Rockets".

My experience also. *The D300 and D700 have never given me problems
that the Giottos 'Rocket' cannot handle. *(Chinese man very clever
to call his brand "Giottos"!)

Yup! I have three of them. One kept in each of the two bags I have,
and one which keeps vanishing in and around the house.
I have reduced my emergency cleaning kit to one of the neat
Photographic Solutions kits.
http://www.photosol.com/dskit.htm
That is there for my peace of mind, not for any cleaning in the
field, but useful when having that "Damn dust!" moment when back in
the motel/hotel room after a day out tripping the shutter.



My Canon EOS 5D bodies were a different matter and needed constant
attention with PEC pads and brushes. *The 5D sensors seemed to have
a static charge which turned them into dust magnets. *I had them
both cleaned four times a year and that wasn't often enough.
*Leaving one lens (24-105mm f/4L IS) semi-permanently fitted didn't
seem to help either.

However, my worst ever DSLR for dust is the Kodak DCS Pro 14n. *If
it wasn't such a sheer delight to use in so many other ways (13.5
MP full frame, incredible sharpness, outstanding colour rendition)
*I would get rid of it because cleaning its sensor is such a
thankless task. *
I
do it myself because even my trusted technician seems unable to do
as good a job as I can. *:-(

Yup! There were times it seemed I could use the D70 as one of those
electronic ionizing air purifiers to remove dust and pollen from the
local environment.

You can actually build a better dust brush than the ones for sale.
Get a cheap smoke detector, remove the Americium-241 source from it
(alpha particle emitter) and attach it to a good sensor or lens
brush. The alpha particles ionize the air and cause the static
charge of the dust to be eliminated, allowing for easy removal of it.
This is something like the old Polonium brushes made by various
companies for vinyl records. Of course, brushing is what you'd do
after using a non-contacting blower like the Rocket.

Yup!
I still have a 30 year old one of those brushes buried in with some of
my audio stuff.
...and in my hand I have a still functioning Zerostat gun, also about
30+ years old. The grip is wrapped with 20+ year old masking tape!

Now I wonder how much that would help de-ionizing the D70 chamber???
Might be worth a try.


You might want to replace the polonium with the americium source. The
polonium half-life isn't too long unless it's polonium 209. The source
has to be open, alpha particles can't penetrate anything.

On Tue, 12 Oct 2010 14:14:22 -0700, Savageduck
wrote:

On 2010-10-12 13:51:16 -0700, John A. said:

On Tue, 12 Oct 2010 10:56:23 -0700, Savageduck
wrote:

On 2010-10-12 10:33:57 -0700, RichA said:

On Oct 12, 11:33*am, Savageduck
wrote:

Le Snip



Yup! There were times it seemed I could use the D70 as one of those
electronic ionizing air purifiers to remove dust and pollen from the
local environment.

You can actually build a better dust brush than the ones for sale.
Get a cheap smoke detector, remove the Americium-241 source from it
(alpha particle emitter) and attach it to a good sensor or lens
brush. The alpha particles ionize the air and cause the static charge
of the dust to be eliminated, allowing for easy removal of it. This
is something like the old Polonium brushes made by various companies
for vinyl records. Of course, brushing is what you'd do after using a
non-contacting blower like the Rocket.

Yup!
I still have a 30 year old one of those brushes buried in with some of
my audio stuff.
...and in my hand I have a still functioning Zerostat gun, also about
30+ years old. The grip is wrapped with 20+ year old masking tape!

Now I wonder how much that would help de-ionizing the D70 chamber???
Might be worth a try.

What's the worst that could happen?

...er nothing.

The passing of beta particles and gamma rays from radioactive decay can
permanently or almost-permanently induce an electrical charge into
insulating layers. (See: electret) Causing permanent or near-permanent hot
or dead pixels. The very same way that any stray gamma and cosmic rays can
leave unusable photosensors behind.

Try it.

You ****ingly stupid high-school drop-out moron, who still thinks that
lenses can be coated with Fluorine.

"Die Faggots" wrote in message

You might want to replace the polonium with the americium source. The
polonium half-life isn't too long unless it's polonium 209. The source
has to be open, alpha particles can't penetrate anything.

While the above information may be useful, I am kill-filing you due to
your obscene ID. PLONK!
--DR

On 10/13/10 PDT 7:27 AM, David Ruether wrote:
wrote in message

You might want to replace the polonium with the americium source. The
polonium half-life isn't too long unless it's polonium 209. The source
has to be open, alpha particles can't penetrate anything.

While the above information may be useful, I am kill-filing you due to
your obscene ID.PLONK!

Of course, David, what an ignorant bigot that guy is. Public plonking,
though, only strokes little egos. And he'll shift nyms soon enough.

--
john mcwilliams

On 2010-10-13 09:33:36 -0700, RichA said:

On Oct 13, 1:42*am, Joel Connor wrote:
On Tue, 12 Oct 2010 14:14:22 -0700, Savageduck



wrote:
On 2010-10-12 13:51:16 -0700, John A. said:

On Tue, 12 Oct 2010 10:56:23 -0700, Savageduck
wrote:

On 2010-10-12 10:33:57 -0700, RichA said:

On Oct 12, 11:33*am, Savageduck
wrote:

Le Snip

Yup! There were times it seemed I could use the D70 as one of those
electronic ionizing air purifiers to remove dust and pollen from th
e
local environment.

You can actually build a better dust brush than the ones for sale.
Get a cheap smoke detector, remove the Americium-241 source from it
(alpha particle emitter) and attach it to a good sensor or lens
brush. *The alpha particles ionize the air and cause the static ch
arge
of the dust to be eliminated, allowing for easy removal of it. *Th
is
is something like the old Polonium brushes made by various companies
for vinyl records. *Of course, brushing is what you'd do after usi
ng a
non-contacting blower like the Rocket.

Yup!
I still have a 30 year old one of those brushes buried in with some o
f
my audio stuff.
...and in my hand I have a still functioning Zerostat gun, also about
30+ years old. The grip is wrapped *with 20+ year old masking tape!

Now I wonder how much that would help de-ionizing the D70 chamber???
Might be worth a try.

What's the worst that could happen?

...er nothing.

The passing of beta particles and gamma rays from radioactive decay can
permanently or almost-permanently induce an electrical charge into
insulating layers. (See: electret) Causing permanent or near-permanent ho
t
or dead pixels. The very same way that any stray gamma and cosmic rays ca
n
leave unusable photosensors behind.

Try it.

You ****ingly stupid high-school drop-out moron, who still thinks that
lenses can be coated with Fluorine.

Magnesium fluoride. Most single-coated lenses used that as their
coating material. It gives the lens surfaces that characteristic
light blue tint.

Yup!
....but talk about that "other guy" missing the point. I was talking
about using the "Zerostat" gun, not the "StaticMaster" brush, for
possible de-ionizing of the chamber, and that does not have either the
Polonium-210, or Americium-241 Alpha particle source. It is a
piezo-electric device.

As for the "StasticMaster" brush, as I said, that is packed away in a
box filled with audio DooDads. Also the Po-210 has a half-life of 138
days, and when fresh it is at a level of 250 microcuries, and needed to
be replaced regularly.

--
Regards,

Savageduck