Sensor cleaning

[Jeremy Nixon]

Musty <musty@nospam.net> wrote:

> I need to re-state. I made a mistake. The problem is that I did not delete
> the "before" pictures off my CF (these were taken afew days ago). The
> pictures I took today after rocket bulb blowing show no dust bunnies!!!
> Hooray!!

Excellent. I've found that blowing is all that is necessary almost all of
the time. You only need to get in there and physically clean it if things
get really bad.

Thanks for the update on that particular product, too.

--
Jeremy | [email]jeremy@exit109.com[/email]

[Larry]

In article <10t91pg1qaaje65@news.supernews.com>, [email]ritaberk2O04@aol.com[/email] says...

> You can get it at your local craft store for drying flowers in 1.5 to 2#
> cans for under $10.00. For reactivation, just bake in a 300* oven for
> several hours.
>
>
> Rita
>
>

Usefull info, thanks for that.


--
Larry Lynch
Mystic, Ct.

[Hils]

Musty wrote

>Do you have a web link to a store which sells this compressed CO2? I could
>not find it. I tried CO2, carbon dioxide etc etc.

Tetenal manufacture compressed CO2 kits, in the UK they're available
from Calumet. Be warned though: I used one on a sensor once and it
worked OK, but when I later used it on a filter it left a layer of what
looked like frost behind, so I won't be risking it on sensors again, or
lenses. Others have also reported residues with the Tetenal CO2. I've
seen it suggested that you should hold the camera with the sensor facing
down and aim the spray at the sides not directly onto the sensor, but
I'm not sure I'd risk even that.

In fact, I'd echo Bob Atkins' suggestion to "forget about the dust spots
you'd never actually seen until you looked for them". :-)

[url]http://www.photo.net/equipment/digital/sensorcleaning/[/url]

--
Hil

[RichA]

On Fri, 31 Dec 2004 22:30:04 +0000, Hils <hils@nospam.demon.co.uk>
wrote:

>Musty wrote
>

>>Do you have a web link to a store which sells this compressed CO2? I could
>>not find it. I tried CO2, carbon dioxide etc etc.

>
>Tetenal manufacture compressed CO2 kits, in the UK they're available
>from Calumet. Be warned though: I used one on a sensor once and it
>worked OK, but when I later used it on a filter it left a layer of what
>looked like frost behind, so I won't be risking it on sensors again, or
>lenses. Others have also reported residues with the Tetenal CO2. I've
>seen it suggested that you should hold the camera with the sensor facing
>down and aim the spray at the sides not directly onto the sensor, but
>I'm not sure I'd risk even that.
>
>In fact, I'd echo Bob Atkins' suggestion to "forget about the dust spots
>you'd never actually seen until you looked for them". :-)
>
>[url]http://www.photo.net/equipment/digital/sensorcleaning/[/url]

I'd stay away from that junk and stick with something like
Chemtronics micro-filtered compressed air. The thing to NEVER
do is tilt the can when you use it. If you'd gotten that film
on a first-surface mirror, that would be the end of it.
-Rich

[ZONED!]

Rita Ä Berkowitz wrote:

>
> Thank you very much for the correction, I'll make note of it for

future

> reference. I do realize you were very excited

Not excited at all, why would you assume that?

> and wanted to be the first person to correct me,

Huh? I could not care less. After a correction is made once, why would
someone ever be second? Are there other corrections that I am missing?

>but in your haste

A little over seven hours is haste to you?

>and bliss

I do not understand the bliss part of that remark at all. I was merely
trying to clarify a few points as politely as I could. I have no
problems at all if anyone else approaches any of my posts in the manner
that I approached yours. I am not very easily offended in RT let alone
an arena such as this.

>you posted three messages on the subject when only one would suffice.

I only posted once. I do not know how the second post appeared and I
could not delete it. I only see two. If I made an error in posting 3
times (as opposed to some sort of glitch for which I am not
responsible) I would have apologized. I attempt to practice good
manners always.

Thank you again.

>
> Rita

I would say any time, but it seems to me that you do not like to be
corrected so I will take that in consideration in the future. I
apologize for having posted anything that would have caused you to
reply in what appears to me to be a condescending manner.

[Rita Ä Berkowitz]

ZONED! wrote:

>
> I would say any time, but it seems to me that you do not like to be
> corrected so I will take that in consideration in the future. I
> apologize for having posted anything that would have caused you to
> reply in what appears to me to be a condescending manner.

Again, I do thank you for the corrections and I am much appreciative that
you took the time to do so. My response wasn't an attempt to be
condescending, as that wasn't my intention. At first glance, I thought it
odd that one would have to point out another's mistake three times. If I
mistakenly responded to you as one would when responding to the typical
Usenet spelling and grammar police that wait in the wings ready to pounce, I
offer my sincerest apologies.



Rita

[ZONED!]

No harm, no foul. It never happened ;o)

[Crownfield]

Musty wrote:

>
> Hi All,
>
> I am about to embark on cleaning my 20D sensor (got a few dust bunnies at
> f/22). I already made some posts about this on r.p.d (but not a specific
> question). My first plan of attack is to use the Rocket blower (which I
> ordered from B&H). My plan is to have my significant other hold a vacuum
> cleaner close (but not too close), while I use the rocket to shoot air on
> the sensor (hoping that the vacuum will suck up the disturbed dust). Has
> anyone tried this? Has anyone actually successfully cleaned their sensor
> without resorting to physical touching techniques??
>
> Also, how long can I expect the camera to stay in the sensor cleaning mode
> when using a fresh battery?

two general notes:

when changing lenses, or removing the lens,
try to keep it upside down so dust falls out, not into the camera.

if the lens comes off to change,
the camera is powered off.

i hear that the reason for the power off
is that the charged sensor attracts dust.

i did not believe that. voltages should be very low.

however, since turning the power off for lens changes,
my S2 has rarely had a dust problem.

> Thanks
> Musty.

[Ken Davey]

Crownfield wrote:

> Musty wrote:

>>
>> Hi All,
>>
>> I am about to embark on cleaning my 20D sensor (got a few dust
>> bunnies at f/22). I already made some posts about this on r.p.d (but
>> not a specific question). My first plan of attack is to use the
>> Rocket blower (which I ordered from B&H). My plan is to have my
>> significant other hold a vacuum cleaner close (but not too close),
>> while I use the rocket to shoot air on the sensor (hoping that the
>> vacuum will suck up the disturbed dust). Has anyone tried this? Has
>> anyone actually successfully cleaned their sensor without resorting
>> to physical touching techniques??
>>
>> Also, how long can I expect the camera to stay in the sensor
>> cleaning mode when using a fresh battery?

>
> two general notes:
>
> when changing lenses, or removing the lens,
> try to keep it upside down so dust falls out, not into the camera.
>
> if the lens comes off to change,
> the camera is powered off.
>
> i hear that the reason for the power off
> is that the charged sensor attracts dust.
>
> i did not believe that. voltages should be very low.
>
> however, since turning the power off for lens changes,
> my S2 has rarely had a dust problem.
>
>

>> Thanks
>> Musty.

One thing I have not seen mentioned in this thread (I know someone will
correct me if I missed it) is NEVER and I mean NEVER hit the sensor with any
sort of compressed gas!!!
The thermal shock this will present to the sensor is only to be imagined -
not - horror of horrors - to be experienced.
To hit a sensor with compressed carbon dioxide, for example, will deposit
dry ice on its surface. Dry ice has a tempersture of -109.3 degrees F.
(-78.5 C).
Do not do this - ever!
Compressed air presents the same (albeit milder) thermal shock risk.
If the sensor survives the thermal shock it will most certainly experience
the deposit of atmospheric water on its (cold) surface shortly threrafter -
thus almost guaranteeing that any dust particles present will be
semi-permanently glued to it.

Just a heads up.

Regards.
Ken.




--
[url]http://www.rupert.net/~solar[/url]
Return address supplied by 'spammotel'
[url]http://www.spammotel.com[/url]

[Charles Robinson]

Crownfield <Crownfield@cox.net> wrote:
:
: i hear that the reason for the power off
: is that the charged sensor attracts dust.

Of course, that charged sensor is also behind a closed shutter, isn't it?

-Charles

--
Charles Robinson
Minneapolis, MN
[email]charlesr@visi.com[/email]
[url]http://www.visi.com/~charlesr[/url]

[Crownfield]

Charles Robinson wrote:

>
> Crownfield <Crownfield@cox.net> wrote:
> :
> : i hear that the reason for the power off
> : is that the charged sensor attracts dust.
>
> Of course, that charged sensor is also behind a closed shutter, isn't it?

Yes.
it seems that i was wrong.


is there a definitive explaination of dust and sensors?
cleaning info is all around, but not the getting dirty mechanism.

what are the shutters made of?

if the shutter is electrically conductive,
then it should block any effect of any charge behind it.
if not conductive, then little effect.

the electrostatic charge has to be very small,
because there is no high voltage in the camera.

I do not understand how the 'charge'
could then have any more effect behind the shutter
whether the camera is off or on when you change the lens.

>
> -Charles
>
> --
> Charles Robinson
> Minneapolis, MN
> [email]charlesr@visi.com[/email]
> [url]http://www.visi.com/~charlesr[/url]

[The Pixel Pirate]

Musty wrote:

>
> Do you have a web link to a store which sells this compressed CO2? I could
> not find it. I tried CO2, carbon dioxide etc etc.
>
>

No link but it is compressed carbon dioxide bottles like you get from a
soda stream kit. Used in most soft drinks and many of the soda water
siphons.

James