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Thread: sensor problem?

  1. #1

    Default sensor problem?

    Need some adivse urgently. Is there something wrong with my sensor? I got this funny white dot at the exact same spot in every picture. cannot be dust as its clearly just 1 pixel. i am using 400D. anyone have such cases before? is it covered by warranty?


  2. #2
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    Default Re: sensor problem?

    Quote Originally Posted by jenson View Post
    Need some adivse urgently. Is there something wrong with my sensor? I got this funny white dot at the exact same spot in every picture. cannot be dust as its clearly just 1 pixel. i am using 400D. anyone have such cases before? is it covered by warranty?

    I believe it's a hot pixel. Just send it back to Canon and request for sensor mapping.
    Canon EOS 5D, 24-70 f/4 L IS, 50 f/1.2 L, 70-300 f/4-5.6 L IS, 600EX-RT. Sigma 12-24 f/4.5-5.6 EX.

  3. #3

    Default Re: sensor problem?

    another sample

  4. #4

    Default Re: sensor problem?

    Quote Originally Posted by Snoweagle View Post
    I believe it's a hot pixel. Just send it back to Canon and request for sensor mapping.
    Do you know if I need to pay for it?

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    Default Re: sensor problem?

    Quote Originally Posted by jenson View Post
    Do you know if I need to pay for it?
    why dont you call up CSC to ask ?

  6. #6
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    Default Re: sensor problem?

    Quote Originally Posted by jenson View Post
    Do you know if I need to pay for it?
    Yes but i doubt it'll cost u more than $40 for mapping.
    Canon EOS 5D, 24-70 f/4 L IS, 50 f/1.2 L, 70-300 f/4-5.6 L IS, 600EX-RT. Sigma 12-24 f/4.5-5.6 EX.

  7. #7

    Default Re: sensor problem?

    Quote Originally Posted by jenson View Post
    Need some adivse urgently. Is there something wrong with my sensor? I got this funny white dot at the exact same spot in every picture. cannot be dust as its clearly just 1 pixel. i am using 400D. anyone have such cases before? is it covered by warranty?


    TS, I believe this in itself is a cropped image. If you look at the original picture at normal size, the dot should not be noticeable. And you can leave it alone as this is a common phenomenon in both SLR and DSLR.
    You will see the dot only, (1) when you blow up your picture (2) a picture of a very dark scene. Otherwise, the dot is not noticieable at all.

    Last, try to cover your lens and take a manual shot, pay more attention to the picture and likely you will see more of such dots.

    so even if you can find 10 dots on a 10MP CCD, it affect 0.0001% area of a picture, it does not matter really. you can clone it away when it appear. Of course, still not happy? pay money to CSC, money can buy happiness.
    Last edited by CT 3833; 29th July 2008 at 12:18 AM.

  8. #8

    Default Re: sensor problem?

    enable noise reduction & let the camera's processing chip handle all the hot pixels
    My flickr! Album - Sony a6000 (CZ 24-70) / CZ 85 F1.4
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  9. #9

    Default Re: sensor problem?

    care to explain what is sensor mapping?

    i have emailed Canon support. service charges itself is $60.. i guess if its under warranty this would be waived. They have suggested for me to bring the camera down to the service ctr... (a reply which i anticipated)

  10. #10

    Default Re: sensor problem?

    Quote Originally Posted by jenson View Post
    care to explain what is sensor mapping?

    i have emailed Canon support. service charges itself is $60.. i guess if its under warranty this would be waived. They have suggested for me to bring the camera down to the service ctr... (a reply which i anticipated)
    try this tip first before spending money.. it worked on my 400D

    http://www.flickr.com/groups/canonds...7606307378467/

    On most Canons there is an ingenious pixel-remap performed every time the manual sensor clean function is activated.

    I know the 350, 400, 20 and 30 do it and the 10 doesn't. I'm pretty sure the 300 does, but I can't remember since it's a while since I used one.

    Anyway, all you have to do is keep a capped lens or body cap on the camera, and activate "sensor clean" from the menu. I don't know if it happens immediately or takes a few seconds as I always do it for a few seconds.

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