light leakage reported for 5D MkIII

Started Apr 6, 2012 | Discussions
cyk
cyk
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light leakage reported for 5D MkIII
Apr 6, 2012

http://www.slrclub.com/bbs/vx2.php?id=newproduct&page=1&divpage=7&ss=on&select_arrange=headnum&desc=asc&no=37367

About 10 users have confirmed the same problem.
Basically, outside light is reaching the sensor through the top LCD panel area.
The original poster recommends the following test:

Remove lens and place the body cap.
Put on the eye-piece cover.
This should theoretically block any light from entering the camera.
Set ISO to 800 and set shutter mode to Av.
You should see a shutter speed of around 10 sec.

Now either shine a flashlight near the top LCD panel area or simply turn on the backlighting of the top LCD panel.

This will cause the shutter speed to fluctulate between 5-8 seconds, indicating light leakage.

Canon EOS 5D
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schmegg
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Re: light leakage reported for 5D MkIII
In reply to cyk, Apr 7, 2012

cyk wrote:

http://www.slrclub.com/bbs/vx2.php?id=newproduct&page=1&divpage=7&ss=on&select_arrange=headnum&desc=asc&no=37367

About 10 users have confirmed the same problem.
Basically, outside light is reaching the sensor through the top LCD panel area.
The original poster recommends the following test:

Remove lens and place the body cap.
Put on the eye-piece cover.
This should theoretically block any light from entering the camera.
Set ISO to 800 and set shutter mode to Av.
You should see a shutter speed of around 10 sec.

Now either shine a flashlight near the top LCD panel area or simply turn on the backlighting of the top LCD panel.

This will cause the shutter speed to fluctulate between 5-8 seconds, indicating light leakage.

Not happening with mine (thankfully).

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IceAero
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Re: light leakage reported for 5D MkIII
In reply to cyk, Apr 7, 2012

Hmm, seems to be affecting mine.

20" with the LCD off and drops to 10 seconds when I turn on the LCD backlight....

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Canon EOS 5D Mark III Canon EF 50mm f/1.8 II Canon EF 100-400mm F4.5-5.6L II
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Drew Saur
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Re: light leakage reported for 5D MkIII
In reply to cyk, Apr 7, 2012

Interesting, and I can confirm the difference in my Mk III as described.

But the light is not hitting the sensor; rather, it would be hitting the metering system, which is housed alongside the prism (which is why all cameras come with eyepiece covers), and I almost have to imagine that this happens with other cameras as well, and I would presume that there is compensation for this, or that it falls within tolerances.

If I had other cameras with me right now I would try to confirm. I am sure others will as this gets out there.

Drew

cyk wrote:

http://www.slrclub.com/bbs/vx2.php?id=newproduct&page=1&divpage=7&ss=on&select_arrange=headnum&desc=asc&no=37367

About 10 users have confirmed the same problem.
Basically, outside light is reaching the sensor through the top LCD panel area.
The original poster recommends the following test:

Remove lens and place the body cap.
Put on the eye-piece cover.
This should theoretically block any light from entering the camera.
Set ISO to 800 and set shutter mode to Av.
You should see a shutter speed of around 10 sec.

Now either shine a flashlight near the top LCD panel area or simply turn on the backlighting of the top LCD panel.

This will cause the shutter speed to fluctulate between 5-8 seconds, indicating light leakage.

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Canochrome
Regular MemberPosts: 105
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Re: light leakage reported for 5D MkIII
In reply to Drew Saur, Apr 7, 2012

Drew Saur wrote:

Interesting, and I can confirm the difference in my Mk III as described.

But the light is not hitting the sensor; rather, it would be hitting the metering system, which is housed alongside the prism (which is why all cameras come with eyepiece covers), and I almost have to imagine that this happens with other cameras as well, and I would presume that there is compensation for this, or that it falls within tolerances.

I haven't checked and I don't intend to, but I suspect that you're right - that the light is leaking slightly into the metering area. I would say that the simple cure is to not shoot in dark situations with the top LCD lit.

-- hide signature --

Tom

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IceAero
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Re: light leakage reported for 5D MkIII
In reply to Canochrome, Apr 7, 2012

What about sunlight hitting the LCD and causing underexposure?

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5DMk3 user Kings
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Re: light leakage reported for 5D MkIII
In reply to cyk, Apr 7, 2012

I can confirm that with my 5d mark3.

What a stupid...

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Canochrome
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Re: light leakage reported for 5D MkIII
In reply to IceAero, Apr 7, 2012

Considering how much light might actually be hitting the metering sensors through this path - I don't see a problem. I mean it's barely noticeable when metering with the lens cap on. More light enters the pentaprism through the viewfinder when those of us wear glasses operate the camera.

I've already been shooting in direct afternoon sunlight and haven't experienced any metering issues. If anything, this body meters better than my Mk II.

Maybe someone should try this test on an older, proven body and see what happens.

-- hide signature --

Tom

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WalterSrChat
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Avoid The Test for light leakage for 5D MkIII as shown
In reply to cyk, Apr 7, 2012

cyk wrote:

http://www.slrclub.com/bbs/vx2.php?id=newproduct&page=1&divpage=7&ss=on&select_arrange=headnum&desc=asc&no=37367

About 10 users have confirmed the same problem.
Basically, outside light is reaching the sensor through the top LCD panel area.
The original poster recommends the following test:

Remove lens and place the body cap.
Put on the eye-piece cover.
This should theoretically block any light from entering the camera.
Set ISO to 800 and set shutter mode to Av.
You should see a shutter speed of around 10 sec.

Now either shine a flashlight near the top LCD panel area or simply turn on the backlighting of the top LCD panel.

This will cause the shutter speed to fluctulate between 5-8 seconds, indicating light leakage.

On your test, you did not remove the eye cup and cover the eye piece with black tape after closing the eye piece cover.

Following the above instructions may damage your camera because you have removed your lens that communicates with your camera and the paths that the electronics is expecting to fond will not be present, so strange results can be expected from the electronics, including circuit failure, due to stress and overheating, caused by partially completed circuits.

There is a science to correctly testing things, and it takes lots of practice to become a proficient tester, so my suggestion is to leave testing to a proficient tester.

Walter Sr
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I am out to take the perfect picture, if it exits!

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NikonForever
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Re: light leakage reported for 5D MkIII
In reply to Canochrome, Apr 7, 2012

from my posting name, you might think I am standing on nikon side, but I did buy canon 5d iii and got the same problem of leakage. Then I tested it on nikon d7000, it turns out no such leakage. that makes me double if I should return canon back as it cost me a fortune? however, I agree that it shouldn't cause a problem since the leakage is minor, only occurs while long exposure, that enlarges the leak significantly. in reality, like me, seldom do 10 sec such long exposure shooting, it should not be a problem in 99 % of my shoots, if I do need long exposure, I will cover the top LCD in this case.

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mkson
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Re: light leakage reported for 5D MkIII
In reply to cyk, Apr 7, 2012

Another Korean user posted comparing 60D and 5DIII regarding leakage of lighteng test.

http://www.slrclub.com/bbs/vx2.php?id=newproduct&page=1&divpage=7&ss=on&select_arrange=headnum&desc=asc&no=37378

Youtube video clip shows that once 5D MKII turns LCD light on shutter speed is changed, but 60D doesn't.

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NikonForever
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Re: light leakage reported for 5D MkIII
In reply to cyk, Apr 7, 2012

by the way, there is no leak at all while shooting live view since the prism is up, no reflection to the sensor.

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DotCom Editor
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What if I'm actually photographing a flashlight? (nt)
In reply to cyk, Apr 7, 2012

What then?

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mkson
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Re: light leakage reported for 5D MkIII
In reply to cyk, Apr 7, 2012

Another video clip shows that light is leaking under day light. Shutter speed is changed as shaded LCD area.

http://www.slrclub.com/bbs/vx2.php?id=newproduct&page=1&divpage=7&ss=on&select_arrange=headnum&desc=asc&no=37387

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cyk
cyk
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Re: light leakage reported for 5D MkIII
In reply to mkson, Apr 7, 2012

This is a serious hardware flaw. I am going to cancel my order.

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Drew Saur
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Re: light leakage reported for 5D MkIII
In reply to cyk, Apr 7, 2012

You're making the assumption that this isn't accounted for somewhere in the design.

I'm not saying that there is definitely nothing wrong, but I have already taken hundreds of photos with my allegedly defective camera and haven't seen anything noticeably wrong with the exposure system. So have many others.

Most notably, in further testing I did not see this happen with the lens cap off - even taken pictures in a dimly lit room with a seriously bright LED flashlight pointing at the LCD, which would presumably be the way most people would take pictures.

So not considering that this isn't accounted for in the design is potentially presumptuous. That's all!

Drew

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OpieSF
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Re: light leakage reported for 5D MkIII
In reply to cyk, Apr 7, 2012

Pure FUD.

I cannot replicate this with or without a lens on the camera. And praytell, why would you worry about exposure jumps WITHOUT a lens on the body?

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dcormier0
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There's a relavent note in the manual...
In reply to cyk, Apr 7, 2012

From page 114 of the Canon 5D Mk III manual (and, coincidentally, page 86 of the Mk II manual):

"If you will not look through the viewfinder when you press the shutter button, attach the eyepiece cover (p.185). If stray light enters the viewfinder when the picture is taken, it may throw off the exposure."

The 1D Mk IV manual has almost identical language on page 102 of its manual, but it refers to the built-in eyepiece shutter rather than the separate eyepiece cover used on lower-end cameras.

Canon is quite aware of it. That's why they give us tools to combat it.

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cyk
cyk
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Re: light leakage reported for 5D MkIII
In reply to Drew Saur, Apr 7, 2012

I agree with what you said. But at the same time I don't feel comfortable plunking down $3500 knowing this potentially serious issue. I'll wait and see how this develops.

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NikonForever
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Re: There's a relavent note in the manual...
In reply to dcormier0, Apr 7, 2012

The question is the leak through top LCD panel that we don't use eye to cover it during shooting. I do consider to return it back.

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