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Thread: Canon 40D View Finder Circular Marks

  1. #1

    Default Canon 40D View Finder Circular Marks

    Hmm I recently noticed this faint circular mark when I look through my 40D.

    It is this faint black lining that forms a perfect circle around the focus points. It is not the spot-meter circle.

    It doesn't show up on the pictures I take so it's probably not on the censor. I have removed the eye cup and wiped the view finder but the marks remain. I have tried on different lenses and the mark is still there, so it's not from the lenses either.

    So I am wondering what the circular mark might be... does any one know? Is it the matt screen?

    It's bugging me quite a bit so any help would be appreciated. Bolded the words to emphasize that it's not the spot-meter circle.

    o - spot metering circle, ( ) - the faint circle shaped mark.

    ( o )

    Ok someone provided the view finder picture. The mark looks something like the oval line except it is not that thick and obvious, I made it so to show that it is not the spot meter circle.

    Last edited by littlewild; 27th September 2008 at 12:44 AM. Reason: Included picture.

  2. #2
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    Default Re: Canon 40D View Finder Circular Marks

    Did you read your manual?

    That's the spot-meter circle.

  3. #3

    Default Re: Canon 40D View Finder Circular Marks

    Quote Originally Posted by calebk View Post
    Did you read your manual?

    That's the spot-meter circle.
    Erm, I can tell the difference between the spot-meter circle which has a CLEAR black line and a FAINT black mark.

    I think I should have emphasized more on the FAINT part.

    let o be the spot-meter circle. the mark looks something like

    ( o )

    the brackets are the FAINT black marks that I am talking about.
    Last edited by littlewild; 27th September 2008 at 12:28 AM.

  4. #4

    Default Re: Canon 40D View Finder Circular Marks

    Please, that's the area which the Spot Metering AF works..4.5% or so coverage which is why there's a circle
    Canon EOS 30D , EF 17-40mm F4L USM , EF-S 55-250mm F/4-5.6 IS

  5. #5

    Default Re: Canon 40D View Finder Circular Marks

    Quote Originally Posted by eosdigital View Post
    Please, that's the area which the Spot Metering AF works..4.5% or so coverage which is why there's a circle
    I will go edit my original post now. Since it is conveying the wrong impression.

  6. #6

    Default Re: Canon 40D View Finder Circular Marks

    Another possibility is that fibres could have get onto your focusing screen.Confirmed if it's never in focus in VF.
    Canon EOS 30D , EF 17-40mm F4L USM , EF-S 55-250mm F/4-5.6 IS

  7. #7
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    Default Re: Canon 40D View Finder Circular Marks



    would that be the circle?
    Our pictures are our footprints. Itís the best way to tell people we were here - JoeMcnally | Flickr

  8. #8

    Default Re: Canon 40D View Finder Circular Marks

    Quote Originally Posted by Headshotzx View Post


    would that be the circle?
    Erm no.

    I think this is my worst post ever... sigh.

    But thanks for providing the pic, I have been looking for it.

    The oval shows the faint marking. I made it thicker to differentiate it from the spot meter circle.


  9. #9

    Default Re: Canon 40D View Finder Circular Marks

    I think its the focusing matte/screen..

  10. #10
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    Default Re: Canon 40D View Finder Circular Marks

    It should be the matte surface of the screen showing up. It's only visible at certain angles when you turn it around to face a light source, right?

  11. #11

    Default Re: Canon 40D View Finder Circular Marks

    Quote Originally Posted by J-Chan View Post
    I think its the focusing matte/screen..
    Hmm I did a search for it just now and what I have read says that the focusing matte screen is supposed to have spot-like patterns and not in a circle?

    It's just the edges of that circle that's visible. The lighting condition is not bright and I am not using a fast lens so I am not sure if it is the matte screen. It's bugging me because I have been taking pictures regularly with this 40D for the past month and I only noticed this mark recently. It's distracting when I take a picture and I notice the mark and the colour difference.

  12. #12

    Default Re: Canon 40D View Finder Circular Marks

    Quote Originally Posted by calebk View Post
    It should be the matte surface of the screen showing up. It's only visible at certain angles when you turn it around to face a light source, right?
    Hmm nope, it's visible at both dim and bright conditions. And it doesn't appear or disappear when I change the angle.

    So it's not the matte surface huh?

  13. #13
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    Default Re: Canon 40D View Finder Circular Marks

    Quote Originally Posted by littlewild View Post
    Hmm nope, it's visible at both dim and bright conditions. And it doesn't appear or disappear when I change the angle.

    So it's not the matte surface huh?
    Hmm I think you might want to bring it down to Canon for a look-see. Doesn't sound normal at all...haha.

  14. #14

    Default Re: Canon 40D View Finder Circular Marks

    Quote Originally Posted by calebk View Post
    Hmm I think you might want to bring it down to Canon for a look-see. Doesn't sound normal at all...haha.
    Oh ok thanks. I hope it's nothing serious.

    On closer inspection I found that the area outside that circle is dimmer by a bit as well....

  15. #15

    Default Re: Canon 40D View Finder Circular Marks

    shld be the lines of the focusing screen. dun worry abt it.

  16. #16

    Default Re: Canon 40D View Finder Circular Marks

    Quote Originally Posted by flipfreak View Post
    shld be the lines of the focusing screen. dun worry abt it.
    Hmm ok thanks!

    It's just weird that I never noticed it before.

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