Help with odd problem 5D exposure/shutter

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Archive 2009 · Help with odd problem 5D exposure/shutter

elader
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p.1 #1 · Help with odd problem 5D exposure/shutter

Hi All,

I recently sold my back up 5D to a great guy here on FM. It was a very lightly used cam, mostly as a back up for Bar Mitzvah shooting in the dark (high ISO, low SS, bounce flash). Upon 'testing' it out, my buyer found the pattern you see in the image below. Shooting a wall, with increasing shutter speed (but NOT constant aperture) he sees this darkening. Now, I thought it might be vignetting - higher SS, lenses wide open, but it looks really kind of severe.I don't have the exif data on the individual images. I guess I should take a look.

It just looks way odd to me to be a focal plane shutter problem. Anyone ever see this before? Whatever it is, if it's broke I have to fix it.... Can you suggest something to try to aid in this diagnostic??

This image is copyrighted by the owner

Nov 08, 2009 at 03:09 PM

elader
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p.1 #2 · Help with odd problem 5D exposure/shutter

wow, 6 hours.. no one at all?

Nov 08, 2009 at 09:23 PM

EB-1
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p.1 #3 · Help with odd problem 5D exposure/shutter

If is happens when the aperture is constant, send it to Canon. Perhaps the shutter needs to be replaced.

EBH

Nov 08, 2009 at 09:31 PM

jcolwell
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p.1 #4 · Help with odd problem 5D exposure/shutter

I would have suggested that it might be a problem with the lens not stopping down fast enough, but that's very unlikely as it was the same with two different L-series lenses.

Nov 08, 2009 at 09:36 PM

200231786
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p.1 #5 · Help with odd problem 5D exposure/shutter

Do you have the CF enabled that automatically corrects the aperture or SS if you've set it beyond what will achieve a correct exposure? i.e. has the exposure darkened because the increase in SS has not been successfully countered by ISO or aperture?

What is the light source (is it constant)? Even in the slower SS ones there is not completely uniform lighting. The severe asymmetry at 1/6400 and 1/8000 really is odd though, which lens was used for the ones posted, or is this asymmetry the same on each tested lens?

Can the test be repeated outside (even daylight)?

J

Nov 08, 2009 at 09:39 PM

elader
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p.1 #6 · Help with odd problem 5D exposure/shutter

you all don't think this is a fluorescent light issue, do you?

Nov 08, 2009 at 10:01 PM

The Image
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p.1 #7 · Help with odd problem 5D exposure/shutter

Ive recently ran into this issue as well, with my 5D, I dont seem to have the issue at slower shutter speeds, I started a thread about mine, sorry I cant give you any helpful info on it, as ive yet to look into the issue http://www.fredmiranda.com/forum/topic/830859/0#7720711

Nov 08, 2009 at 10:38 PM

Yohan Pamudji
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p.1 #8 · Help with odd problem 5D exposure/shutter

elader wrote:
you all don't think this is a fluorescent light issue, do you?

Hard to say since I've never had enough light to shoot at 1/1600 and up under fluorescent light

Maybe ask the buyer to try again using tungsten light source or daylight if the original test was done under fluorescent?

Nov 09, 2009 at 12:51 AM

elader
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p.1 #9 · Help with odd problem 5D exposure/shutter

happens under sunlight. must be the shuddering shutter ;-(

Nov 09, 2009 at 03:36 AM

MaxiKana
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p.1 #10 · Help with odd problem 5D exposure/shutter

At least according to finnish law, if a private person sells something to another private person the seller isn't responsible if the goods break after one usage time or during shipping. Dunno how it is in the US.

Nov 09, 2009 at 07:06 PM

elader
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p.1 #11 · Help with odd problem 5D exposure/shutter

MaxiKana wrote:
At least according to finnish law, if a private person sells something to another private person the seller isn't responsible if the goods break after one usage time or during shipping. Dunno how it is in the US.

Well... it's not exactly broke if you shoot under 1/2000th of a second

Seriously, if I sell something and in good faith represent it as working according to specifications and it turns out with someone who tests more thoroughly than me that there is something wrong, I feel that I have to make it right. Now if the issue was 'my lens back-focuses on your camera' or something like that... well...

I am a firm believer in not screwing my fellow photographers. FM buy-and-sell is a sacred trust.

Nov 09, 2009 at 09:02 PM

RobertLynn
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p.1 #12 · Help with odd problem 5D exposure/shutter

My guess is the shutter is failing.

Send it to Canon and see. Since, it's only doing it at high shutter speeds, you know what I mean?

Nov 09, 2009 at 09:17 PM

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