GrizzlyMan Senior Member  376 posts Likes: 1 Joined Aug 2008 Location: Doylestown, PA More info | Mar 09, 2009 13:13 | #1 Ok something odd came up yesterday. I pulled out my 40D to go on a shoot and after taking one or two shots I noticed a light circle in my viewfinder. I took off my lenes and looked at everything and noticed it was on my focusing screen? www.ThruKurtsLens.com
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JimG I feel thoroughly satisfied  12,255 posts Likes: 2 Joined Jun 2005 Location: Australia. More info | Mar 09, 2009 13:14 | #2 Light circle? As in a scuff on the mirror or what do you mean? Can you take a photo? Gear Listhttp://www.codastudios.com.au
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GrizzlyMan THREAD STARTER Senior Member 376 posts Likes: 1 Joined Aug 2008 Location: Doylestown, PA More info | Mar 09, 2009 13:21 | #3 Jim G wrote in post #7487541  Light circle? As in a scuff on the mirror or what do you mean? Can you take a photo? The mirror is clean. when you turn the camera upside down and look up at the focus screen I can see it. I guess I should take out the focus screen? never did that. www.ThruKurtsLens.com
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ef2 Goldmember  1,135 posts Joined Jan 2008 Location: Pittsburgh More info | Mar 09, 2009 13:26 | #4 Is it directly in the middle of the focus screen? 5D Mk III
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doctorgonzo Member  217 posts Joined Jun 2008 Location: Minneapolis, MN More info | Mar 09, 2009 13:29 | #5 Is it the spot metering circle? Canon 40D — Canon EF-S 17-55mm f/2.8 IS USM — Canon EF 28-135mm f/3.5-5.6 IS USM — Canon EF 50mm f/1.8 — Canon Speedlite 430EX II — A long B&H wish list!
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GrizzlyMan THREAD STARTER Senior Member 376 posts Likes: 1 Joined Aug 2008 Location: Doylestown, PA More info | Mar 09, 2009 13:30 | #6 ef2 wrote in post #7487635 Is it directly in the middle of the focus screen? No it runs close to the edge of the viewfinder. its not in the center. when you look through the viewfinder it runs close to the outside edge and is one quarter inch think, like a band. Now thats looking throught the viewfinder. When you look at the screen it is visable to my eye. www.ThruKurtsLens.com
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GrizzlyMan THREAD STARTER Senior Member 376 posts Likes: 1 Joined Aug 2008 Location: Doylestown, PA More info | Mar 09, 2009 13:32 | #7 doctorgonzo wrote in post #7487653 Is it the spot metering circle? spot metering circle? no it is not its very light not solid like a scuff in plexi glass www.ThruKurtsLens.com
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basroil Cream of the Crop  8,015 posts Likes: 2 Joined Mar 2006 Location: STL/Clayton, MO| NJ More info | Mar 09, 2009 13:51 | #8 Ignore doctorgonzo, he doesn't know the difference between spot and center weighted I don't hate macs or OSX, I hate people and statements that portray them as better than anything else. Macs are A solution, not THE solution. Get a good desktop i7 with Windows 7 and come tell me that sucks for photo or video editing.
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ef2 Goldmember 1,135 posts Joined Jan 2008 Location: Pittsburgh More info | Mar 09, 2009 13:52 | #9 Just take it out and give it a good blow. 5D Mk III
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Steve-R Member  239 posts Joined Sep 2007 Location: Virginia More info | Mar 09, 2009 20:47 | #10 The 40D focusing screen has a circular fresnel pattern molded into the surface. That is what you are seeing. Steve
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Matblack Hatchling 4 posts Joined Mar 2009 More info | I wonder if its the same as my problem
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GrizzlyMan THREAD STARTER Senior Member 376 posts Likes: 1 Joined Aug 2008 Location: Doylestown, PA More info | Mar 10, 2009 08:24 | #12 Matblack wrote in post #7493487 I wonder if its the same as my problem http://www.talkphotography.co.uk …s/showthread.php?t=117811 Almost looks like the ring a mug of water would leave on a table, very light grey but very obvious to the eye, its definately a circle and I think its on the focusing screen, its been there since I bought the camera and I've asked them to order in a new one. Its not supposed to be there, I've looked through a number of 40ds and none of them have it the screen is totally clear on those as it was on the 300d. MB Thats it! but mine just appeared? Thats the starnge part. Its not like I never noticed it before I'm a little observant. I contacted Canon and they are fixing it. www.ThruKurtsLens.com
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Matblack Hatchling 4 posts Joined Mar 2009 More info | Mar 10, 2009 08:29 | #13 GrizzlyMan wrote in post #7493575 Thats it! but mine just appeared? Thats the starnge part. Its not like I never noticed it before I'm a little observant. I contacted Canon and they are fixing it. What did they say Grizzly? I'd be interested to know what caused it, mine was like it out of the box I can't see anything which would cause it, nothing that shape which might impact with it its a complete mystery and looks on mine like too was casued in the manufacturing process, how very strange. Glad you are getting it fixed though, because mine arrived with it I've managed to persuade the retailer to replace the unit just waiting for them to get stock in
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smorter Goldmember  4,506 posts Likes: 19 Joined Nov 2007 Location: Melbourne, Australia More info | Mar 10, 2009 08:30 | #14 My 5D2 has the circular fresnel pattern too Wedding Photography Melbourne
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Matblack Hatchling 4 posts Joined Mar 2009 More info | Mar 10, 2009 08:41 | #15 smorter wrote in post #7493604 My 5D2 has the circular fresnel pattern too Honestly if you could see it I think you'd realise its not right  The grey ring is the only area the mark appears in and although its perfectly circular it varies slightly in its opacity almost in concentric rings or a smear caused a circular polishing process. As its a brand new unit and as the retailer has agreed to replace it I'm not going to remove the focusing screen (I don't have the tool anyway) but if I look up into the camera with the lens off the mark is visible in what I assume to be the focusing screen (the next stage after the mirror?) MB
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The one in the center is a 9% circle (last i checked at least, 20d/30d), and is very fine, not that easy to see, but a perfect circle. If it's slightly ovular, chances are that it is actually just the fresnel pattern showing up. Both are perfectly normal.
