Canon 40D View Finder Circular Marks


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Jul 31, 2008
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#1
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.

 

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calebk

Senior Member
Jul 25, 2006
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Clementi
#2
Did you read your manual?

That's the spot-meter circle.
 

Jul 31, 2008
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#3
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.
 

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Feb 11, 2008
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#4
Please, that's the area which the Spot Metering AF works..4.5% or so coverage which is why there's a circle :bsmilie:
 

Jul 31, 2008
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#5
Please, that's the area which the Spot Metering AF works..4.5% or so coverage which is why there's a circle :bsmilie:
I will go edit my original post now. Since it is conveying the wrong impression.
 

Feb 11, 2008
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#6
Another possibility is that fibres could have get onto your focusing screen.Confirmed if it's never in focus in VF. :D
 

Jul 31, 2008
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#8


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.

 

J-Chan

Senior Member
Sep 21, 2005
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#9
I think its the focusing matte/screen..
 

calebk

Senior Member
Jul 25, 2006
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Clementi
#10
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?
 

Jul 31, 2008
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#11
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. :(
 

Jul 31, 2008
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#12
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? :(
 

calebk

Senior Member
Jul 25, 2006
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Clementi
#13
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.
 

Jul 31, 2008
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#14
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.... :(
 

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