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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 16 Jan 2012 (Monday) 15:32
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40D problem?

 
marsaz
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Jan 16, 2012 15:32 |  #1

Hello,

I got my 40D used and cheap (about 250$) but there were reasons for that. One of them being 100k shutter actuations. Since it can be easily replaced if broken i'm good with that.

I did not notice any problems with the body at first but later i found some bands in pictures. Usually they are in the same position. Not really a problem in well exposed and bright pictures but sometimes you can see a hint of it in darker places. Underexposed images are a different story. I've attached a worse case scenario. The picture was underexposed and brightened by 1 stop in pp so the bands are clearly visible.

Anyone know if this might an indication of a dieing sensor? Or what could have caused it?

Maybe i should start thinking of another body? That would be a shame because i really loved how it outperformed my old 350D in every single way :(

Any feedback appreciated, thanks!


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rick_reno
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Jan 16, 2012 17:12 |  #2

is the banding always horizontal?




  
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marsaz
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Jan 16, 2012 17:31 |  #3

rick_reno wrote in post #13715163 (external link)
is the banding always horizontal?

Yes


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yogestee
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Jan 16, 2012 19:48 as a reply to  @ marsaz's post |  #4

I'm thinking banding from underexposure.

My 20D does the same thing with high iso underexposed shots.


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marsaz
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Jan 17, 2012 03:55 |  #5

yogestee wrote in post #13716135 (external link)
I'm thinking banding from underexposure.

My 20D does the same thing with high iso underexposed shots.

This was ISO 200.
Also the lines always appear at the same place. My 350D never does that when underexposed. Even in correctly exposed pictures you can get a hint of that line on someones black dress or similar.


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cfcRebel
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Jan 17, 2012 14:53 |  #6

I don't think the banding is caused my underexposure. If that's the case, there would be more banding on various part of the image.
If the position of the band is always consistent, then it might be coming from the shutter. Check some underexposed images shot in portrait orientation. See how the banding appears.


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marsaz
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Jan 17, 2012 15:24 |  #7

cfcRebel wrote in post #13720656 (external link)
I don't think the banding is caused my underexposure. If that's the case, there would be more banding on various part of the image.
If the position of the band is always consistent, then it might be coming from the shutter. Check some underexposed images shot in portrait orientation. See how the banding appears.

It appears vertically at around the same place


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cfcRebel
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Jan 17, 2012 16:08 |  #8

It's likely coming from the shutter. Give Canon support a call, see if they can confirm based on your images.


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marsaz
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Jan 17, 2012 17:30 |  #9

cfcRebel wrote in post #13721109 (external link)
It's likely coming from the shutter. Give Canon support a call, see if they can confirm based on your images.

Hm, care to explain what shutter has to do with this? I thought this is indicating some kind of a problem with the sensor.

The call would probably be a good idea too :)


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Jan 17, 2012 18:12 |  #10

Perhaps you should try to shoot with the lens cap on in the dark, with a 5-10 sec exposure and no Noise Reduction for long exposure (if your camera has this type of NR).

If you see bands, it's most likely the sensor...


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Tiberius
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Jan 17, 2012 18:30 |  #11

Looks like a sensor issue to me too. My 40D has never given me this kind of problem.


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40D problem?
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