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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 12 Jun 2011 (Sunday) 03:34
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50D FOCUSING PROBLEM

 
macca172
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Jun 12, 2011 03:34 |  #1

Greetings, Used my 50D last weekend and after I downloaded the shots, I noted that they were all out of focus? Did some tests with some of the various lenses in my kit(Tamron 18-200mm, Sigma 120-400mm, Canon 28-135mm, Canon L Series 70-200mm etc etc) and the problem continued. It gives the appearance of being camera shake, however most of the test shots were taken utlizing a tripod and being remotely fired. I have attached a couple of the test shots. Any help or advise would be greatly appreciated. Many thanks, Macca


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yogestee
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Jun 12, 2011 09:42 |  #2

Macca,, I checked out the EXIF on your first pic.

Model = Canon EOS 50D
Exposure Time = 1/60"
F Number = F5.6
Focal Length = 297mm

How sturdy is your tripod? A wobbly tripod is sometimes worse than handholding. Also, did you support (by hand) the lens/camera while shooting?



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amfoto1
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Jun 12, 2011 11:12 |  #3

It's great that you included some examples... too often people don't do that and it's pretty impossible to give advice. Are these 100% crops? I'm guessing they are, or something close to it.

I agree with Jurgen that the first example could easily be camera shake at that focal length... especially if that's a non-IS/OS lens... even on a tripod.

The second example could be camera shake too... 1/100 at 73mm is pushing your luck a bit on a crop camera. Why not use a higher ISO to get a faster shutter speed and be safer? (It's at 160). I notice the second file is titled "Monopod", too... was it shot on a tripod or monopod?

Of course, we don't know your experience and skill levels, just what you've told us so far.... Could be you have been shooting with the camera for years, know all the tricks to get accurate focus, are using perfect techniques and just that the camera's AF is a bit out of calibration. Or are you new to this camera and using an autofocus SLR?

Before sending it in to be checked I'd check my setup first, that I don't have something set incorrectly... and clean the lens-to-camera contacts (dampen a clean, lint free rag with a little isopropyl/rubbing alcohol and carefully wipe the contacts... that's all that is usually needed).

What focusing mode and methods are you using? One Shot? AI Servo? Live View? Single focus point? All Points? Back Button Focusing? Etc.?

Some more info might help us help you.


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macca172
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Jun 12, 2011 13:55 |  #4

Guys,
Thank you very much for getting back to me. A wealth of information given. The two shots supplied as an example were only two of approx 200 I shot for test purposes, both in the auto and creative selections and various other settings, all to no avail. I just plucked out two of them so to speak for example purposes. None of the shots shave been cropped, straight out of the camera. With the focusing mode, I have covered all selections, once again to no avail. Contacts have been cleaned with isopropyl. I am getting the feeling the processor in the camera had died? Once again thank you for the wealth of information and advice. My level of experience is medium and my 50D has approx shot 30K in the last two years I have had it, never before have I had any focusing problems? Macca


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Tony_Stark
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Jun 13, 2011 02:24 |  #5

You are using long lens with no IS at slow SS and expect to have a sharp image? The first example is clearly camera shake. The tripod used obviously is not stable enough to support the lens and camera. Also looks to me to be in a lower light situation. Try shooting some other subjects in broad daylight handheld using the 1/focal length shutter speed and post some new shots.


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macca172
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Jun 13, 2011 02:37 |  #6

Tony, Thank you for your input, however it has been confirmed that the 50D has a processor problem and more than likely I am advised, will required a complete processor replacement. We hitched up a 400D to the same lenses, TV, AV, subjects and light conditions and the shots turn out without a tad of focus blur. I agree with you that the first example appeared to be camera shake, however in the example shown, it is the dodgey processor giving that appearance. Luckily I took out an extended four year warranty when I initially bought the 50D, hence I will not be out of pocket. Regards, Macca


Canon 5D MkII, 50D and 400D with Grip: Canon 70-200 2.8L: Sigma 120-400: Tamron 18-200and a few others!

  
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watt100
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Jun 13, 2011 04:11 |  #7

macca172 wrote in post #12583797 (external link)
Tony, Thank you for your input, however it has been confirmed that the 50D has a processor problem and more than likely I am advised, will required a complete processor replacement. We hitched up a 400D to the same lenses, TV, AV, subjects and light conditions and the shots turn out without a tad of focus blur. I agree with you that the first example appeared to be camera shake, however in the example shown, it is the dodgey processor giving that appearance. Luckily I took out an extended four year warranty when I initially bought the 50D, hence I will not be out of pocket. Regards, Macca

so you have sent it to Canon to confirm a "processor problem" ?




  
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Tony_Stark
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Jun 13, 2011 16:06 |  #8

macca172 wrote in post #12583797 (external link)
Tony, Thank you for your input, however it has been confirmed that the 50D has a processor problem and more than likely I am advised, will required a complete processor replacement. We hitched up a 400D to the same lenses, TV, AV, subjects and light conditions and the shots turn out without a tad of focus blur. I agree with you that the first example appeared to be camera shake, however in the example shown, it is the dodgey processor giving that appearance. Luckily I took out an extended four year warranty when I initially bought the 50D, hence I will not be out of pocket. Regards, Macca

Sucks the hear the processor is blown :confused: Hope everything gets fixed up soon and get back to using this amazing camera :)


Nikon D810 | 24-70/2.8G | 58/1.4G
EOS M | 22 f/2 STM

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macca172
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Jun 13, 2011 17:11 |  #9

Watt, Yes confirmed, I was at the Canon authorised service centre yesterday and they bench tested the 50D while I was there! Not that rare apparently.


Canon 5D MkII, 50D and 400D with Grip: Canon 70-200 2.8L: Sigma 120-400: Tamron 18-200and a few others!

  
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Snydremark
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Jun 13, 2011 17:50 |  #10

Yeah, that second shot looks like there's something bad in the system...you'd be pretty hard pressed to get that look with all of the poor technique in the world. Glad to hear that they're going to get it taken care of for you, though.


- Eric S.: My Birds/Wildlife (external link) (7D MkII/5D IV, Canon 10-22 f/3.5-4.5, Canon 24-105L f/4 IS, Canon 70-200L f/2.8 IS MkII, Canon 100-400L f/4.5-5.6 IS I/II)
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