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Dust visible at f/36 - Photography

I just tried a shot at f/36 with the D70 & it looks like someone splattered mud on my lens. Is that sensor dust? It is invisible at reasonable f-stops. Here is a 100% crop: <http://www.edgehill.net/1/?SC=go.php&DIR=California/Bay-Area/San-Francisco/2005-01-19-view/f-stop-test&PG=1&PIC=2> That's bad! This is just a tiny bit of the image & they are solid black. Or is that gunk on the end of the lens in focus due to the greater depth of field? I can see a big fleck of shiny something about 1/2-inch inside the front, I tried dusting off the sensor gently & removing the filter from the front & ...

  1. #1

    Default Dust visible at f/36

    I just tried a shot at f/36 with the D70 & it looks like someone
    splattered mud on my lens. Is that sensor dust? It is invisible at
    reasonable f-stops. Here is a 100% crop:
    <http://www.edgehill.net/1/?SC=go.php&DIR=California/Bay-Area/San-Francisco/2005-01-19-view/f-stop-test&PG=1&PIC=2>
    That's bad! This is just a tiny bit of the image & they are solid black.

    Or is that gunk on the end of the lens in focus due to the greater depth
    of field? I can see a big fleck of shiny something about 1/2-inch inside
    the front, I tried dusting off the sensor gently & removing the filter
    from the front & dusting that with canned air. The blobs remained in
    position. I know my house is very dusty & I also shoot out in the woods,
    etc.
    paul Guest

  2. #2

    Default Re: Dust visible at f/36


    "paul" <net> wrote in message
    news:net... 

    Those are UFOs.


    Rudy Guest

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  4. #4

    Default Re: Dust visible at f/36


    "paul" <net> wrote in message
    news:net... 

    It's sensor dust.

    Bart

    Bart Guest

  5. #5

    Default Re: Dust visible at f/36


    "paul" <net> wrote in message
    news:net... 
    <http://www.edgehill.net/1/?SC=go.php&DIR=California/Bay-Area/San-Francisco/
    2005-01-19-view/f-stop-test&PG=1&PIC=2> 

    Use the rocket bulb er. It worked for me on the 20D.


    Musty Guest

  6. #6

    Default Re: Dust visible at f/36

    Rather horrible, isn't it?
    paul Guest

  7. #7

    Default Re: Dust visible at f/36

    Bart van der Wolf wrote:
     
    >
    >
    > It's sensor dust.[/ref]


    Yeah I guess so. I just tried a little shot of air with the mirror
    lock-up this time (doh) & lost some of them but will have to get a
    proper cleaning kit or technique.

    Strange the way they are only visible at such a crazy f-stop. Just
    hideous though!
    paul Guest

  8. #8

    Default Re: Dust visible at f/36


    "paul" <net> wrote in message
    news:net... 
    >>
    >>
    >> It's sensor dust.[/ref]
    >
    >
    > Yeah I guess so. I just tried a little shot of air with the mirror
    > lock-up this time (doh) & lost some of them but will have to get a
    > proper cleaning kit or technique.[/ref]

    Yes, the better ones are:
    http://www.visibledust.com/sensorbrush.htm (it really works, I can say
    from experience), and
    http://www.pbase.com/copperhill/ccd_cleaning for the really stubborn
    stuff.
     

    At those narrow apertures, the cone of light that's focused on the
    sensor's pixels is very narrow, which tends to produce sharp/harsh
    shadows.

    Bart

    Bart Guest

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    Steve Guest
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  10. #10

    Default Re: Dust visible at f/36

    How did you lock the mirror up? I thought the D70 didn't have mirror
    lockup?

    Avery Guest

  11. #11

    Default Re: Dust visible at f/36

    Avery wrote: 


    He's talking about cleaning, with mirror up, not during photoshooting.
    chris Guest

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  13. #13

    Default Re: Dust visible at f/36

    It's in the Custom Functions...

    On 21 Jan 2005 20:14:30 -0800, "Avery" <net>
    wrote:
     

    --------------------------------
    Leith Guest

  14. #14

    Default Re: Dust visible at f/36

    > Yes, the better ones are: 

    Seconded, works as advertised. Expensive, but I don't have to go to a
    service center and I don't feel right about putting liquids inside my
    camera.

    Jean


    jean Guest

  15. #15

    Default Re: Dust visible at f/36

    paul wrote:
    ----------cut 
    -----------cut

    Doctors know this phenomenon as "mouches voulantes" in the human eye.
    When the pupil (aperture) is narrow because of bright light one can see the
    anomalies in the media of the eye more clearly.
    I expect the same to happen in camera's.
    --
    Regards,
    Hyperion
    hyperion Guest

  16. #16

    Default Re: Dust visible at f/36

    hyperion wrote: 
    >
    > -----------cut
    >
    > Doctors know this phenomenon as "mouches voulantes" in the human eye.
    > When the pupil (aperture) is narrow because of bright light one can see the
    > anomalies in the media of the eye more clearly.
    > I expect the same to happen in camera's.[/ref]

    You mean when we see 'floaters' in our sight?

    (I believe you mean 'mouches volantes')
    ==

    Cheers,
    Alan


    --
    -- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm
    -- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm
    -- [SI] gallery & rulz: http://www.pbase.com/shootin
    -- e-meil: there's no such thing as a FreeLunch.
    Alan Guest

  17. #17

    Default Re: Dust visible at f/36

    "Bart van der Wolf" <spam> wrote in message
    news:41f1aeb5$0$6215$xs4all.nl... [/ref][/ref]
    <http://www.edgehill.net/1/?SC=go.php&DIR=California/Bay-Area/San-Francisco/
    2005-01-19-view/f-stop-test&PG=1&PIC=2> 
    > >
    > >
    > > Yeah I guess so. I just tried a little shot of air with the mirror
    > > lock-up this time (doh) & lost some of them but will have to get a
    > > proper cleaning kit or technique.[/ref]
    >
    > Yes, the better ones are:
    > http://www.pbase.com/copperhill/ccd_cleaning for the really stubborn
    > stuff.[/ref]

    used it on my d70 - very happy with the results...

    sid


    sid Guest

  18. #18

    Default Re: Dust visible at f/36

    Alan Browne- wrote:
     
    >>
    >> -----------cut
    >>
    >> Doctors know this phenomenon as "mouches voulantes" in the human eye.
    >> When the pupil (aperture) is narrow because of bright light one can see
    >> the anomalies in the media of the eye more clearly.
    >> I expect the same to happen in camera's.[/ref]
    >
    > You mean when we see 'floaters' in our sight?
    >
    > (I believe you mean 'mouches volantes')[/ref]

    Yes, indeed! (Both questions ;-) )
    --
    Regards,
    Hyperion
    hyperion Guest

  19. #19

    Default Re: Dust visible at f/36

    Locking up the mirror on a D70 is only for cleaning, not for shooting.


    "Leith Cassone" <net> wrote in message
    news:com... 
    >
    > --------------------------------[/ref]


    Sheldon Guest

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