CCD dust imaging

Discussion in 'Digital SLR' started by Alan Browne, Dec 14, 2004.

  1. Alan Browne

    Alan Browne Guest

    p.110 of Maxxum 7D manual: "The DiMAGE Master software can remove the affects of
    dust from RAW images. This is done by taking a dust reference image before
    cleaning the CCD. For more on this process, see the DiMAGE Master manual."

    -has anyone tried this?

    -do other cameras (Canon, Nikon...) have this feature?

    Alan Browne, Dec 14, 2004
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  2. Alan Browne

    Ed Ruf Guest

    My D70 does, though I haven't used it.
    Ed Ruf Lifetime AMA# 344007 ()
    Ed Ruf, Dec 14, 2004
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  3. Alan Browne

    RobO Guest

    Hi Alan
    Please note I have NO experience in this field - my wife has a D70 and we
    are both still learning BUT - today I was looking at this
    You may find the reference useful?
    RobO, Dec 14, 2004
  4. Alan Browne

    RichA Guest

    This is like taking a dark frame to reference hot pixels then
    subtracting them out from long exposure images.
    RichA, Dec 14, 2004
  5. I haven't even been able to find a source for the Dimage Master
    software... it's not the same as the Dimage Viewer s/w that ships with
    the 7D from what I have read...

    What I have been doing here since I've already run into dust problems
    with my 7D (we've had the mortar replacement project from hell going on
    at our building for over six months now...) is to set the smallest
    f/stop and take an out of focus shot of a blank wall. The small f/stop
    helps make the dust shadows shaper and more contrasty, as they are
    sitting on the cover layer a bit above the actual CCD.

    I review the shot either in the LCD or on the computer to see where the
    crud has settled, put the 7D into CCD clean mode, and go after it with a
    gentle squeeze blower, keeping in mind that the crud's location will be
    flipped and reversed as you view the CCD - my eyes are bad enough that I
    can't see the actual crud on the sensor as I clean it, so I usually
    repeat the above steps to be sure I got it all.

    Bob ^,,^
    Bob Harrington, Dec 15, 2004
  6. Alan Browne

    Robert Guest

    Has anyone found the info on a tacky probe made for sensor cleaning that was
    just tacky just enough to pick up dust but did not leave any residue behind.
    Robert, Dec 15, 2004
  7. Alan Browne

    Don Farias Guest

    I suggest that you read the information in these links before you do
    attempt sensor cleaning.


    Don F
    Don Farias, Dec 15, 2004
  8. Alan Browne

    Don Farias Guest

    I forgot to include this link which you might find useful.

    Don F
    Don Farias, Dec 15, 2004
  9. Alan Browne

    Alan Browne Guest

    Yes indeed. Thanks,
    Alan Browne, Dec 15, 2004
  10. Alan Browne

    Alan Browne Guest

    I understand _what_ it is.

    I'm wondering about how good it is in application and whether other vendors have
    the same feature (per other replies so far, the D70 supports this).

    Alan Browne, Dec 15, 2004
  11. Alan Browne

    Alan Browne Guest

    I think the wipe method might be better, esp on very fine dust. See the RobO post.

    Alan Browne, Dec 15, 2004
  12. Alan Browne

    Todd H. Guest

    Yeah, Canons have a 'sensor clean' in their menu.

    It's clever math for dealing with pixels darkened by the presence of
    dust. Or it applies a median filter to selected "dark" pixels to
    future images.
    Todd H., Dec 15, 2004
  13. Alan Browne

    Alan Browne Guest

    I'm not so sure that it's so 'clever', kind of a neat thing to do (and a
    responsible OEM thing to do for the camera owners).

    I'm really wondering: has anyone used it and how were the results?

    Alan Browne, Dec 16, 2004
  14. Alan Browne

    Ed Ruf Guest

    It does require you to shoot raw nef and post process the images in Nikon
    Capture, which is an extra cost.
    Ed Ruf Lifetime AMA# 344007 ()
    Ed Ruf, Dec 16, 2004
  15. Alan Browne

    Don Farias Guest

    I tried it (for testing purposes only) using my D70 and it works.
    The procedure is take a dust reference picture of a blank sheet of paper
    at a small aperture (f22 in my test). There were at least 3 very visible
    dust specks and several less visible specks.
    A "dust reference" option is selected in the camera and a unique file
    extension name designator is given to the reference picture. I immediately
    took second picture of the blank paper in the normal shooting mode.
    The next step is to load the "normal" picture in the Nikon Capture
    software and then apply the dust removal option. The dust specks were then
    removed with no trace at all of the offending dust specks.
    I manually removed the dust specks and I don't normally shoot at f22 so I
    don't have a dust problem in normal shooting. I assume the process would
    work as well with normal picture content vs.: a blank sheet of paper.
    Don F
    Don Farias, Dec 16, 2004
  16. Which --- at least in the 20D --- flips up the mirror and
    opens the shutter so you can clean the sensor. :)

    There may or may not be a way to hide the dust using the Canon PC

    Wolfgang Weisselberg, Dec 16, 2004
  17. Alan Browne

    Alan Browne Guest

    Alan Browne, Dec 16, 2004
  18. Alan Browne

    John Francis Guest

    That's a very big assumption. Could you tell if your image of the sheet
    of paper was too soft? If it were missing detail in those areas? What
    if there was a linear feature (an edge, or a thin line) running across
    the speck?
    John Francis, Dec 16, 2004
  19. Alan Browne

    Lourens Smak Guest

    It's just a camera setting that flips up the mirror and opens the
    shutter, so you can reach the sensor; nothing more...sorry....

    Olympus is the only camera manufacturer so far that offers a real
    solution to the dust problem.

    Lourens Smak, Dec 16, 2004
  20. Alan Browne

    Don Farias Guest

    What I am saying (albeit indirectly) is that dust specks on my sensor
    have never been a real problem for me in 10 months of shooting. Picture
    content varies and I normally crop and print 8 X 10s.
    I did take a few shots (with "normal" detail) with a known dirty sensor
    and found it difficult to find any visible problem with shots a f8 and f11.
    Shooting a clear blue sky at f22 is a problem. (Using "auto contrast" in
    PhotoShop amplifies the dust problem if there is any doubt of it's
    Bottom line ... it makes much more sense to me to clean a dirty sensor
    rather than go through a cumbersome procedure to mask the problem.
    Don F
    Don Farias, Dec 16, 2004
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