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Thread started 15 Apr 2012 (Sunday) 02:52
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Canon EOS 5D Mark III Service Advisory - Light Leak Phenomenon

 
BHollis
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Apr 18, 2012 10:38 |  #61

ChrisJ_SLH wrote in post #14285153 (external link)
That's interesting. I haven't personally been able to get any change to register with the lens cap of yet, not that I've been trying a lot.

One question for you, as your lens cap was off, was there any possibility of reflected illumination from either the LCD back light or flash light to find its way through the lens in a normal manner, ie could they have just been lighting the room (or whatever) sufficiently to cause the meter change?

I suppose it's possible, but it strikes me as extremely unlikely. The LCD light isn't all that bright, and the light from it would have had to shine upward onto an 8 foot ceiling (although i suppose some light could have shown on my face), and then been reflected forward onto the wall I was metering. I just don't think so. Moreover, if this were the source of the light entering the camera, I would have expected the flashlight to have had a noticeably greater effect than the LCD light, since the flashlight was emitting far more light into the room.

But if someone's interested, they might try the test again controlling for this factor. As for me, at this point I think I'll just keep shooting and enjoying my 5D3 and wait for Canon's pronouncement,




  
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ChrisJ_SLH
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Apr 18, 2012 11:39 |  #62

BHollis wrote in post #14286595 (external link)
I suppose it's possible, but it strikes me as extremely unlikely. The LCD light isn't all that bright, and the light from it would have had to shine upward onto an 8 foot ceiling (although i suppose some light could have shown on my face), and then been reflected forward onto the wall I was metering. I just don't think so. Moreover, if this were the source of the light entering the camera, I would have expected the flashlight to have had a noticeably greater effect than the LCD light, since the flashlight was emitting far more light into the room.

Thanks for the further info.

BHollis wrote in post #14286595 (external link)
But if someone's interested, they might try the test again controlling for this factor. As for me, at this point I think I'll just keep shooting and enjoying my 5D3 and wait for Canon's pronouncement,

Couldn't agree more. In real terms not an issue to me and many others and doesn't detract from a great camera.




  
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cfibanez
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Apr 18, 2012 12:46 |  #63

BHollis wrote in post #14284233 (external link)
Since the operating range of the 5D3's light meter is Ev 1 to 20 according the manual, I decided to try testing for the light leak phenomenon at a light level equivalent to Ev 1--the minimum light light level at which the 5D3's light meter can be relied upon to provide an accurate reading. Although I'm not an expert on Ev levels, after consulting a chart on Wikipedia, I determined that at f/5.6 and ISO 100, Ev 1 would correspond to a shutter speed of 15 seconds. (If I'm wrong about this, I'm sure someone will tell me.) So I set my 5D3 to ISO 100, and my lens to f/5.6, took off the lens cap, covered the viewfinder eyepiece, and found a dark environment where the 5D3's meter gave me a shutter speed of 15 seconds. Then I pressed the LCD illumination button to see what, if anything, would happen.

Having previously convinced myself that the leak leak phenomenon was only likely to manifest itself at Ev levels far below Ev 1, I fully expected to see no change in the shutter speed. But to my surprise, I did see a change, although only a slight one--from 15 seconds to 13 seconds. Shining a flash light directly into the top LCD resulted in a similar change.

I then repeated the test by moving to a very slightly brighter area where the meter gave me a reading of 5 seconds--corresponding to something just over Ev 2. When I pressed the LCD illumination button this time, I saw no change, nor did I see any change with the flashlight.

So, what conclusions do I draw from this. Well, contrary to my earlier assumption, it does appear that this phenomenon could affect metering within the 5D3's published metering range--but only at the very bottom of the range--around Ev 1--and only very slightly--the difference between 15 seconds and 13 seconds. If you're trying to meter at lower light levels, say around Ev -4 where most of the testing I've seen posted has been occurring, the effect on the meter reading will likely be more significant, but of course, any metering you might try to do at Ev -4, or any other level below Ev 1, is already inherently unreliable.

Bottom line for me: Yes, the phenomenon is real and can affect meter readings in very low light levels of Ev 1 and below, but so long as I avoid using the lcd illumination button while metering in the dark, or shining flash lights into the top of my camera, I just don't see it being a problem. And I don't think that's going to be difficult for me, since after owning my 7D for around 2-1/2 years, I don't recall ever using the lcd illumination button.

It will be interesting to see what Canon says about all this, though.

This is perhaps the first most useful response I have seen to this issue.
I am to pick my 5D3 in a few days and was naturally concerned about this.
Thanks for sharing the results of your test!


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idsurfer
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Apr 18, 2012 13:45 |  #64

Well I am of the opinion that this "issue" can't have any real impact on performance in 99.9999% of my real world use. I am curious though are there any other "issues" that I have missed that may actualy be worth being concerned about? Was there something about the rear LCD? Sorry, I just don't have the patience to wade through all the posts. Thanks...as you may be able to tell from my signature I have a bit of interest!


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sandpiper
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Apr 18, 2012 13:53 |  #65

idsurfer wrote in post #14287544 (external link)
Well I am of the opinion that this "issue" can't have any real impact on performance in 99.9999% of my real world use. I am curious though are there any other "issues" that I have missed that may actualy be worth being concerned about? Was there something about the rear LCD? Sorry, I just don't have the patience to wade through all the posts. Thanks...as you may be able to tell from my signature I have a bit of interest!

There are a couple of other issues, which are actual issues, yes. There have been reports of error 80 shutdowns plaguing some cameras, this seems to be linked to use of WiFi cards I believe. There is also a problem with noisy IS on the 200 f/2 lens and (I think) the 800, although there is supposed to be a firmware fix in the works for that one.




  
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Andrew_WOT
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Apr 18, 2012 13:56 |  #66

BHollis wrote in post #14284233 (external link)
Since the operating range of the 5D3's light meter is Ev 1 to 20 according the manual, I decided to try testing for the light leak phenomenon at a light level equivalent to Ev 1--the minimum light light level at which the 5D3's light meter can be relied upon to provide an accurate reading. Although I'm not an expert on Ev levels, after consulting a chart on Wikipedia, I determined that at f/5.6 and ISO 100, Ev 1 would correspond to a shutter speed of 15 seconds. (If I'm wrong about this, I'm sure someone will tell me.) So I set my 5D3 to ISO 100, and my lens to f/5.6, took off the lens cap, covered the viewfinder eyepiece, and found a dark environment where the 5D3's meter gave me a shutter speed of 15 seconds. Then I pressed the LCD illumination button to see what, if anything, would happen.

Having previously convinced myself that the leak leak phenomenon was only likely to manifest itself at Ev levels far below Ev 1, I fully expected to see no change in the shutter speed. But to my surprise, I did see a change, although only a slight one--from 15 seconds to 13 seconds. Shining a flash light directly into the top LCD resulted in a similar change.

I then repeated the test by moving to a very slightly brighter area where the meter gave me a reading of 5 seconds--corresponding to something just over Ev 2. When I pressed the LCD illumination button this time, I saw no change, nor did I see any change with the flashlight.

So, what conclusions do I draw from this. Well, contrary to my earlier assumption, it does appear that this phenomenon could affect metering within the 5D3's published metering range--but only at the very bottom of the range--around Ev 1--and only very slightly--the difference between 15 seconds and 13 seconds. If you're trying to meter at lower light levels, say around Ev -4 where most of the testing I've seen posted has been occurring, the effect on the meter reading will likely be more significant, but of course, any metering you might try to do at Ev -4, or any other level below Ev 1, is already inherently unreliable.

Bottom line for me: Yes, the phenomenon is real and can affect meter readings in very low light levels of Ev 1 and below, but so long as I avoid using the lcd illumination button while metering in the dark, or shining flash lights into the top of my camera, I just don't see it being a problem. And I don't think that's going to be difficult for me, since after owning my 7D for around 2-1/2 years, I don't recall ever using the lcd illumination button.

It will be interesting to see what Canon says about all this, though.

Great test, I was unable to reproduce it in very dimly lit room, but could make shutter speed change from 8" to 6" when turning LCD illumination on in pitch black closet, it was so dark I didn't see anything through viewfinder. Chances of me shooting in such conditions - I'd say close to none, shining flashlight onto top LCD or turning on back light at the same time - I probably have better chances winning in a State lottery or being hit by a meteor.




  
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cmosman
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Apr 18, 2012 15:25 as a reply to  @ Andrew_WOT's post |  #67

Just a point, but why not use the back LCD and change the screen using the info button to check settings. Far easy to read and see than the top display ?? And then you can leave the lens cap off !


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idsurfer
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Apr 18, 2012 18:38 |  #68

sandpiper wrote in post #14287586 (external link)
There are a couple of other issues, which are actual issues, yes. There have been reports of error 80 shutdowns plaguing some cameras, this seems to be linked to use of WiFi cards I believe. There is also a problem with noisy IS on the 200 f/2 lens and (I think) the 800, although there is supposed to be a firmware fix in the works for that one.

Thanks...I don't an prob will never own either of those lenses. Also, I don't even know how to use a Wifi card with acamera. I feel like I am prob. good to go. BTW, isn't it not out of the ordinary for new cameras to have little glitches like these mentioned? Then they get fixed with firmware updates?


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bikeboynate
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Apr 18, 2012 19:16 |  #69

idsurfer wrote in post #14289027 (external link)
BTW, isn't it not out of the ordinary for new cameras to have little glitches like these mentioned? Then they get fixed with firmware updates?

Nothing comes out perfect the first time. Even the D800 is experiencing back focus problems, so yes. That's why there are firmware updates anyways. ;)


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sandpiper
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Apr 18, 2012 19:19 |  #70

idsurfer wrote in post #14289027 (external link)
Thanks...I don't an prob will never own either of those lenses. Also, I don't even know how to use a Wifi card with acamera. I feel like I am prob. good to go. BTW, isn't it not out of the ordinary for new cameras to have little glitches like these mentioned? Then they get fixed with firmware updates?

You're right, it isn't unusual for the early buyers to be testers and find the odd glitches. They do generally get sorted out though, either through firmware or hardware, which you can send it in for. Anything that Canon develops a fix for will be retro fitted to all early cameras.




  
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HyperYagami
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Apr 18, 2012 23:41 |  #71

http://www.the-digital-picture.com/News/News-Post.aspx?News=2267 (external link)



5D3 and a few lens
es.

  
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matt84au
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Apr 19, 2012 04:37 |  #72


I wonder if this is true? I order mind back in march & was told I would be getting mind with in the 1 lot to come in, but since the light leak has come to life my camera order in now on hold from Canon Aus, anybody else in the same boat.


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dchen99
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Apr 19, 2012 08:19 |  #73

idsurfer wrote in post #14289027 (external link)
BTW, isn't it not out of the ordinary for new cameras to have little glitches like these mentioned? Then they get fixed with firmware updates?

That's common for not only cameras, also other stuff like cars. If you can wait, it's a smart to not just rush out to get the first batch.


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ChrisJ_SLH
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Apr 19, 2012 09:12 |  #74

matt84au wrote in post #14291274 (external link)
I wonder if this is true? I order mind back in march & was told I would be getting mind with in the 1 lot to come in, but since the light leak has come to life my camera order in now on hold from Canon Aus, anybody else in the same boat.


While at the same time we have this...

http://www.canonrumors​.com …iii-not-getting-recalled/ (external link)

While I don't personally have any practical issue with mine, I hope Canon release an official statement soon just to quell all the FUD on this issue.




  
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idsurfer
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Apr 19, 2012 09:16 |  #75

dchen99 wrote in post #14291791 (external link)
That's common for not only cameras, also other stuff like cars. If you can wait, it's a smart to not just rush out to get the first batch.

If I have a camera on the way is it in the first batch? Just curious. I have decided that this "issue" is not ever in the slightest going to effect me, but hey, I'm as AR as the next camera geek! ;)


Cory
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