Cleaning the Mirror, etc.

Discussion in '35mm Cameras' started by inki, Apr 30, 2009.

  1. inki

    inki Guest

    Hi. After picking up an old Canon T50, & lenses, at a second-hand
    place, I went ahead and tried cleaning up the camera body. As I now
    know, the inner elements are best left to blowers and a soft brush.
    However, at the time of my first contact with the device, I tried
    blowing out the dust orally and wound up with an even worse

    Now, when looking through the viewfinder, one can be distracted by
    some dried stains that indicate where splashes of fluid hit the

    Is there an easy way to wash the inner parts of an slr camera body, if
    the problem is more than just dust?
    inki, Apr 30, 2009
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  2. inki

    blu2 Guest

    blu2, May 1, 2009
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  3. inki

    Peter Irwin Guest

    I have used 99% isopropyl alcohol and Q-tips to clean SLR mirrors
    without obvious problems. Be sure to change Q-tips often and be very
    gentle. You may need quite a bit of patience. I have heard of people
    harming mirrors this way, but I've had no problem. Work very slowly
    and stop if you are doing harm to the mirror surface.

    You may want to think about having the cleaning done by a camera

    Peter Irwin, May 1, 2009
  4. inki

    tony cooper Guest

    On this subject...There are three spots that show up in my images if I
    shoot so the sky is in the background. They are circled in red on the
    linked image. (Forget the subject; I'm just using it to show the

    They are not noticeable with any other background. So far. Always in
    the same place, so they are something on the lens or the mirror of my
    Nikon D40. I can't see them looking at the lens or the mirror. I've
    cleaned both with isopropyl alcohol, but it doesn't help.

    tony cooper, May 1, 2009
  5. Try acetone instead of alcohol; that's what optics people use to clean
    lenses. As Peter said, be very very gentle. Blow out any loose dust and
    dirt first to avoid dragging particles across the delicate mirror
    surface (keep in mind that this is a first-surface mirror, so you're not
    cleaning glass here).
    David Nebenzahl, May 1, 2009
  6. inki

    Colin.D Guest

    tony cooper wrote:

    Not on the lens or the mirror. Cannot be the mirror as it is up when
    the exposure is made, and any dust or marks on a lens element is totally
    out of focus and will have no effect on the image.

    The spots are actually on the sensor, or the AA filter in front of the
    sensor. You need to clean the sensor, or get it cleaned. Tons of info
    on how to do this on google.

    Colin D.
    Colin.D, May 1, 2009
  7. inki

    tony cooper Guest

    Found this on the web in a forum responding to a problem just like

    Sounds like you found the "sensor", really a filter or glass over the
    sensor. When you remove the lens, you see the mirror. Put the camera
    in bulb mode and lock the shutter open, and that's the "sensor".
    Ensure that you have plenty of battery power (or are hooked up to the
    AC/DC adapter) before you stick anything into the sensor cavity. If
    the shutter closes while you have something in the cavity, the shutter
    will break, and you will need an expensive repair.

    I have to clean my cameras often, since I shoot outdoors and change
    lenses many times a day. I have found that compressed air takes care
    of most problems, and a $10 bulb, like Mark mentioned, is the best way
    to go for field work. If you are willing to put a little more $$ into
    it, get an oil-less diaphragm compressor for an airbrush, ~$100. The
    other nice thing about air is that you don't put anything in the
    shutter cavity.

    DO NOT use "canned air", these little cans with compressed air in
    them. They contain isobutane and other hydrocarbon propellants which
    can "spit" out of the can and leave spots on the sensor that will
    require a liquid cleaning to remove.
    tony cooper, May 1, 2009
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