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Pixel Peeping (and dust on Sensor)

Discussion in 'Open Discussion' started by BillN, Dec 4, 2010.

  1. BillN

    BillN Mu-43 All-Pro

    Jan 19, 2010
    SW France
    I've been pixel peeping and discovered three "marks" - what do you think - cannot see anything on the lens, sensor etc., but I will have to take a good look with a different lens etc., etc.,

    What do you think

    Mega crop
    pixel_peep2.

    Original
    pixel_peep.
     
  2. Herman

    Herman Mu-43 All-Pro

    Feb 7, 2010
    The Netherlands
    Hi Bill, seems you catched an UFO ! It's your first wikimft. Just kidding, I don't know what it is, with what camera did you photograph, hope it's not your L..c.
     
  3. BillN

    BillN Mu-43 All-Pro

    Jan 19, 2010
    SW France
    thanks Herman - it is the LLLLLLL iiiiiiiiii ccccccc aaaaaaaahhhhhh - but not surprised as there are many quirks - luckily there is still 15 months warranty left on the cam
     
  4. Streetshooter

    Streetshooter Administrator Emeritus

    Dec 15, 2009
    Phila, Pa USA
    It looks like the sensor. Maybe left over cleaning solution or condensation.
     
  5. BillN

    BillN Mu-43 All-Pro

    Jan 19, 2010
    SW France
    better get my "dust pan and brush" out then

    PP can sort it - most of the time - but that's not the point

    pixel_peep3.
     
  6. Streetshooter

    Streetshooter Administrator Emeritus

    Dec 15, 2009
    Phila, Pa USA
    Do you have a sensor cleaning kit?
    The Copperhill is the best. I also have a sensor loupe.
    It shines a light to the sensor and you can see if anything is there.
     
    • Like Like x 1
  7. BillN

    BillN Mu-43 All-Pro

    Jan 19, 2010
    SW France
    no sensor cleaning stuff just washing up liquid etc., and a good brush

    Seriously - I'll have a good look it the morning light and come back to you for advice as I will need it

    So I need a loupe to inspect it, maybe a good blower, (all I have are the usual brush blowers), and then maybe some cleaning (liquid),

    Thanks Don
     
  8. Streetshooter

    Streetshooter Administrator Emeritus

    Dec 15, 2009
    Phila, Pa USA
    Bill,
    The sensor cleaning solution dries fast and with almost to no streaks.
    The pads leave no fibers behind.
    The loupe let's you see very closely and clearly what is or isn't on the sensor.
    I also have a small pen sized anti static vacuum cleaner.
    A blower is a no no as it moves dust around from the inner body and the sensor.

    Check out Copperhill...
    Don
     
    • Like Like x 1
  9. BillN

    BillN Mu-43 All-Pro

    Jan 19, 2010
    SW France
    Just a couple of question

    1). Can the sensor be damaged by shining a very bright light at it - There is a very thin piece of glass in front of it - right?

    2). Is the (digital) image inverted - i.e. if I see marks on the bottom left of the screen image I should look to the top right of the sensor for these marks

    Cheers
     
  10. I think the final image is inverted (top to bottom and left to right). I use the Lenspen Sensorklean.
     
  11. usayit

    usayit Mu-43 Hall of Famer

    seen those artifacts many times..... most likely dust on the sensor.

    Hold the cameras upside down and use a blower but Not compressed air.
     
  12. PeterB666

    PeterB666 Mu-43 Top Veteran

    780
    Jan 14, 2010
    Tura Beach, Australia
    Peter
    Yeah - dust bunnies rule!!!!

    They are a pain in the rear and MFT cameras rather fond of them. I have wondered why the shutter doesn't close when lenses are removed. That would keep the sensor a lot cleaner.
     
  13. I had a bad one show up on the bottom right of photos about two weeks into a six week trip to the middle east earlier this year. My blower (which was all I had with me) wouldn't budge it, so I ended up having to reverse my potrait technique (rotating the camera clockwise instead of anti-clockwise) so the spot would be lost in amongst the detail instead of sticking out like dog's proverbials in the sky.
     
  14. Rudi

    Rudi Mu-43 Top Veteran

    574
    Aug 16, 2010
    Australia
    It's definitely sensor crud of some sort. Easy to get rid of.
     
  15. 996gt2

    996gt2 Mu-43 Regular

    42
    Oct 27, 2010
    Looks like sensor dust. Dust that's really stuck on there will not come off after the camera's built-in cleaning. Micro 4/3 is really susceptible to dust during lens changes because there is no mirror/shutter protecting the sensor from dust.

    I'd recommend a wet-clean.

    The problem does not appear at large apertures (say f/2), correct? If it's dust, it won't show up until you've stopped down to f/5.6 or later.
     
  16. BillN

    BillN Mu-43 All-Pro

    Jan 19, 2010
    SW France
    High - yes problem appeared at f8

    M8 - Kodak sensor - 1.3 x crop

    will take it gently and have a go at removal

    Thanks for all your replies and advice

    Cheers
     
  17. Boyzo

    Boyzo Mu-43 Top Veteran

    784
    Mar 3, 2010
    I wondered that too if shutter were closed must be a reason why they
    Pany and Oly did not go that route
     
  18. BillN

    BillN Mu-43 All-Pro

    Jan 19, 2010
    SW France
    If you want to get really anal - chose a high f number - aim at a light coloured wall - press the shutter and move the camera around a little while it is exposing the shot, (the dirt is on the sensor so it does not matter about focus of lens or keeping the cam still)

    Then PP and convert to B & W - move the black slider up to increase the black and then the exposure slider to lighten the exposure

    Like stars in the sky only reverse

    (the other marks are the wallpaper plus the image is lit from the right side (dark edge on left) plus inconsistent light(ing))

    dust.
     
    • Like Like x 1
  19. BillN

    BillN Mu-43 All-Pro

    Jan 19, 2010
    SW France
    Don, as usual no Copperhill kits retailed in the UK - I'll keep searching but at least I can use their web site for guidance.

    Note to other: there are some strange "sensor cleaning videos" on UTube - if you are going to clean your sensor do as much research as you can as some suggest methods that other say you should not use, i.e. the correct use of compressed air


    May be useful

    http://www.copperhillimages.com/index.php?pr=tutorials

    Cheers
     
  20. Streetshooter

    Streetshooter Administrator Emeritus

    Dec 15, 2009
    Phila, Pa USA
    Bill,
    If you like, I can order the kit and send it to you.
    Let know your thoughts.
    Don