Sensor cleaning

Discussion in 'Digital SLR' started by Musty, Dec 29, 2004.

  1. I know what you are talking about, but I can't think of which chemical that
    is. You might be using some form of molecular sieve as used in HVAC driers?
    You can get silica gel with indicator beads mixed in. The beads are blue
    when dry and pink when wet.
    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 Ä Berkowitz, Dec 30, 2004
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  2. Musty

    Musty Guest

    Tried the rocket bulb. It made no difference. At least it did not make
    matters worse. Looks like I'll have to use more intrusive techniques...
    Musty, Dec 31, 2004
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  3. Musty

    Musty Guest

    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!!!
    Musty, Dec 31, 2004
  4. Musty

    Jeremy Nixon Guest

    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 Nixon, Dec 31, 2004
  5. Musty

    Larry Guest

    Usefull info, thanks for that.
    Larry, Dec 31, 2004
  6. Musty

    Ron Lacey Guest

    Glad to hear that, I was going to suggest you take it to a
    professional rather than take more drastic measures your self. After
    over three years of using DSLRs I've never met a dust bunny I couldn't
    conquer with the bulb<g>.


    Ron Lacey
    Murillo Ontario
    Ron Lacey, Dec 31, 2004
  7. Musty

    Hils Guest

    Musty wrote
    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". :)
    Hils, Dec 31, 2004
  8. Musty

    RichA Guest

    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.
    RichA, Jan 1, 2005
  9. Musty

    ZONED! Guest

    Not excited at all, why would you assume that?
    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?
    A little over seven hours is haste to you?
    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.
    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.
    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.
    ZONED!, Jan 2, 2005
  10. 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 Ä Berkowitz, Jan 2, 2005
  11. Musty

    ZONED! Guest

    No harm, no foul. It never happened ;o)
    ZONED!, Jan 2, 2005
  12. Musty

    Crownfield Guest

    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.
    Crownfield, Jan 4, 2005
  13. Musty

    Ken Davey Guest

    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.

    Ken Davey, Jan 4, 2005
  14. :
    : 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 Robinson, Jan 4, 2005
  15. Musty

    Crownfield Guest

    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.
    Crownfield, Jan 4, 2005
  16. 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

    The Pixel Pirate, Jan 5, 2005
  17. Musty

    Tom Nelson Guest
    "...the temperature in Vostok, Antarctica, dropped to nearly -89.2 °C,
    the lowest temperature ever recorded on Earth."

    "Although still unofficial, Vostok Station may have broken its own
    record for the coldest temperature on Earth. It has been reported that
    Vostok reached the temperature of -91 °C during the winter of 1997."

    Did carbon dioxide begin to precipitate out of the air?

    Tom Nelson
    Tom Nelson Photography
    Tom Nelson, Jan 5, 2005
  18. Musty

    Jeremy Nixon Guest

    The carbon dioxide that comes out of my blower is room temperature.
    Jeremy Nixon, Jan 5, 2005
  19. Musty

    Ron Lacey Guest

    Any dust that's gets in the body can end up on the sensor during an
    exposure, the flipping of the mirrow will stir up the air and the
    opening of the shutter curtains will let dust in. This isn't so much
    a problem with film slrs because you use a new frame of film for every
    shot but with a digital you use the same film (the sensor) over and
    over again.


    Ron Lacey
    Murillo Ontario
    Ron Lacey, Jan 5, 2005
  20. Frozen CO_2 thaws at temperature, correct.
    Your URL confirms:
    | "Vostok station (Russian) NEW RECORD SET IN 1997!!! This is
    | an unconfirmed report from Vostok Station during the winter
    | of 1997. -91 °C (-132 °F) This is colder than Dry Ice! The
    | "official"record is also from Vostok station on July 21, 1983
    | -89.2 °C (-128.6 °F)"
    Probably not, since:
    | This chilly weather is due to the exceptionally high speed of
    | the arctic winds. The katabatic or downward type winds that
    | bring the brisk temperature, travel with speeds up to 200 mph
    | (about 90 m/s) from inland toward the coast of the continent.
    this wind will remove any visible precipitation.

    Chances are that the wind is CO_2 poor anyway ...

    Wolfgang Weisselberg, Jan 6, 2005
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