Page 1 of 2 12 LastLast
Results 1 to 20 of 22

Thread: Help needed for the "spotted" picture (pic inside)

  1. #1

    Default Help needed for the "spotted" picture (pic inside)

    hi all i had been facing this problem recently with my canon 20D.. sometimes i got this


    its really bad.. but thing is it doesn;t happen all the time.Only 3 out of 10 pics will have this problem.. the rest are ok like this below..(both pic using same lens taken same day same time )



    what is the cause of this and what can i do about it?
    i did tyr sensor cleaning using the build in function and did blower .. but think not helping..

    would really appreciate any help..
    thanks
    Last edited by tionghan; 14th October 2007 at 01:40 AM.

  2. #2
    Member
    Join Date
    Nov 2003
    Location
    Yishun
    Posts
    589

    Default Re: Help needed for the "spotted" picture (pic inside)

    I presume u're talking about the dots right? Have u checked the filter? or the lense? the 2nd pic look like some oil stain. Did u use your finger to clean the filter or front element of the lense?

  3. #3

    Default Re: Help needed for the "spotted" picture (pic inside)

    hi ,
    sorry not for being clear enough for my question..
    its actually yes, the black circle dot that infested the whole of pic #1..

    pic #2 is ok.. i posted it up to compare the differences.. have not touch the lens nor the filter.. these 2 shots were actually taken after one another.. so what puzzle me is if its sensor or lens dirty.. how come only one of them is 'dotted'

    thanks for reading...

  4. #4

    Default Re: Help needed for the "spotted" picture (pic inside)

    what are the aperture values for both pics?

  5. #5

    Default Re: Help needed for the "spotted" picture (pic inside)

    Quote Originally Posted by ptwong View Post
    I presume u're talking about the dots right? Have u checked the filter? or the lense? the 2nd pic look like some oil stain. Did u use your finger to clean the filter or front element of the lense?
    tink the second pic is the flash reflection off the glass table.
    Gallery | Facebook Page Spreading the Good photography.

  6. #6

    Default Re: Help needed for the "spotted" picture (pic inside)

    Quote Originally Posted by Rashkae View Post
    what are the aperture values for both pics?
    here's the exif
    pic #1 =
    - Exposure Time = 1/80 sec [0.013]
    F Number = 20
    Exposure Program = Manual
    ISO Speed Ratings = 800
    Flash = Flash fired, compulsory flash mode, red-eye reduction mode
    Focal Length = 28 mm

    pic #2 =

    Exposure Time = 1/80 sec [0.013]
    F Number = 5
    Exposure Program = Manual
    ISO Speed Ratings = 100
    Flash = Flash fired, compulsory flash mode, red-eye reduction mode
    Focal Length = 24 mm

    I had check with all other good and bad pics.. not the ISO..., and dun think its the aperture also..

  7. #7

    Default Re: Help needed for the "spotted" picture (pic inside)

    i suppose the spots can also be refer as blemish??

  8. #8
    Member
    Join Date
    Jan 2005
    Location
    Hougang
    Posts
    1,507

    Default Re: Help needed for the "spotted" picture (pic inside)

    those are likely to be caused by dusts on your sensor.. which tends to show up more in smaller aperture... you seew the spots in picture 1 because it was shot at f/20, but dont see it in the 2nd picture because it was shot at f/5.

    Take a look at your other pictures which the spots show up again and see the aperture values.. you should be able to see a pattern.

  9. #9

    Default Re: Help needed for the "spotted" picture (pic inside)

    Quote Originally Posted by rOnGrEn View Post
    those are likely to be caused by dusts on your sensor.. which tends to show up more in smaller aperture... you seew the spots in picture 1 because it was shot at f/20, but dont see it in the 2nd picture because it was shot at f/5.

    Take a look at your other pictures which the spots show up again and see the aperture values.. you should be able to see a pattern.
    Sounds the most logical and likely cause.

    If you wanna confirm, you can shoot a white wall or the daytime, clear area of sky at the smallest apeture and download into PhotoSHop and use the AUTO curves adjustment to check.

  10. #10

    Default Re: Help needed for the "spotted" picture (pic inside)

    Quote Originally Posted by rOnGrEn View Post
    those are likely to be caused by dusts on your sensor.. which tends to show up more in smaller aperture... you seew the spots in picture 1 because it was shot at f/20, but dont see it in the 2nd picture because it was shot at f/5.

    Take a look at your other pictures which the spots show up again and see the aperture values.. you should be able to see a pattern.
    Just checked all other picture.. you are right bro.. all those from f20 and above all the dust are shown...
    thanks for that!

    now.. is there a special method to clean this dust that appear in small aperture? or just do normal cleaning?
    Last edited by tionghan; 14th October 2007 at 03:18 AM.

  11. #11

    Default Re: Help needed for the "spotted" picture (pic inside)

    20D does not have an ultrasonic cleaner.

    If you switched on the clean sensor function in the menu for a long time, that means that you have opened the shutter all this while allowing more dust to reach the sensor.

    If you want to clean the sensor yourself, Google copperhill sensor cleaning and take your time to read very carefully. Or send to Canon Servicing Center.

  12. #12

    Default Re: Help needed for the "spotted" picture (pic inside)

    Quote Originally Posted by Dream Merchant View Post
    20D does not have an ultrasonic cleaner.

    If you switched on the clean sensor function in the menu for a long time, that means that you have opened the shutter all this while allowing more dust to reach the sensor.

    If you want to clean the sensor yourself, Google copperhill sensor cleaning and take your time to read very carefully. Or send to Canon Servicing Center.
    yes , i guess i opened the shutter too long, just realise the sensor cleaning function is acutally just to lock up the mirror so that i can clean the sensor that's all. .. that's why so much dust enters into the sensor.. been trying to blow a while just now.. managed to get rid some of it.. but still more work to be done..

    finally its dust.. although sian abt it but at least i know what it is..

    thanks everyone for the immediate help.. appreciate

  13. #13

    Default Re: Help needed for the "spotted" picture (pic inside)

    That's right, 20D has no dust removal functions.
    You're just in cleaning mode for you to raise the mirror so that the sensor would be exposed for you to do the cleaning manually, by using a blower or a sensor swab.
    Send it to the service centre to get it cleaned.

  14. #14

    Default Re: Help needed for the "spotted" picture (pic inside)

    #1 is definitely dust issue from CMOS. They are visible when shot in small aperture like f16 or smaller.

    Time to clean your dirty CMOS.
    See my Photo Gallery at the Clubsnap

  15. #15

    Default Re: Help needed for the "spotted" picture (pic inside)

    Quote Originally Posted by megaweb View Post
    #1 is definitely dust issue from CMOS. They are visible when shot in small aperture like f16 or smaller.

    Time to clean your dirty CMOS.
    yeah... now thinking of sending it CSC.. anyone knows how long they'll take?

  16. #16

    Default Re: Help needed for the "spotted" picture (pic inside)

    Quote Originally Posted by tionghan View Post
    yeah... now thinking of sending it CSC.. anyone knows how long they'll take?

    mirror lockup, large blower...DIY

  17. #17

    Default Re: Help needed for the "spotted" picture (pic inside)

    Quote Originally Posted by XC Pictorial View Post
    mirror lockup, large blower...DIY
    did that for at least 1 hour with large blower liao.. but still got dust leh.. until i gave up..

  18. #18

    Default Re: Help needed for the "spotted" picture (pic inside)

    Quote Originally Posted by rOnGrEn View Post
    those are likely to be caused by dusts on your sensor.. which tends to show up more in smaller aperture... you seew the spots in picture 1 because it was shot at f/20, but dont see it in the 2nd picture because it was shot at f/5.

    Take a look at your other pictures which the spots show up again and see the aperture values.. you should be able to see a pattern.
    yep, is definitely that after seeing the aperture values

    Quote Originally Posted by XC Pictorial View Post
    mirror lockup, large blower...DIY
    hurhur, sometimes large blower not enough
    singapore always have welded dust, common because the humidity is high
    would probably need sensor swab/wet cleaning
    for people who have serious issues with this (i.e. always shooting at small apertures, like me)
    learn how to diy, will save you big bucks in the long run after all

  19. #19

    Default Re: Help needed for the "spotted" picture (pic inside)

    Quote Originally Posted by tionghan View Post
    did that for at least 1 hour with large blower liao.. but still got dust leh.. until i gave up..
    to check for dust

    find a white surface
    set to manual focus
    shoot at maximum smallest aperture with slight overexposure, e.g. +0.5

    blow

    check again, compare the 2 pictures
    if the dust is moving around, then it is probably unwelded dust (dust without moisture), if you blow long enough should go
    if the dust is not moving around then it is probably welded dust
    then you would surely need wet cleaning

  20. #20

    Default Re: Help needed for the "spotted" picture (pic inside)

    It's definitely dust on ur sensors seen at f20 and not at f5..... Clean it
    Sony a7rii + Batis 2/25
    Gitzo 1530 + Markins Q3

Page 1 of 2 12 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •