singel09
Posts: 135
Joined: Thu Jan 20, 2005 12:32 pm

Canon 10D Autofocus

Mon Aug 22, 2005 10:13 pm

I posted a topic a few weeks ago on buying a second hand Canon 10D. The buyer bailed out of it, because he claims the serial is one of a series that had issues with the autofocus and was recalled by Canon.

Now he called me and offers me the camera again ... interesting. As I am still interested, I want to see if there are indeed known issues with the autofocus of the camera.

Any feedback ?

Mause
 
IL76
Posts: 2237
Joined: Mon Jan 05, 2004 5:43 am

RE: Canon 10D Autofocus

Mon Aug 22, 2005 10:24 pm

My 10D autofocus sometimes acts up losing focus exactly when the shutter is fired. Quite frustrating. Also I noticed it started to hunt more often. Perhaps it's dirty inside? I can't recall my EOS 50 having the same issues, but that one was never used as intensive.

E
 
aviopic
Posts: 2423
Joined: Sat Mar 13, 2004 7:52 pm

RE: Canon 10D Autofocus

Tue Aug 23, 2005 6:38 am

There have been a lot of talks about the first series 10D because some of them seemed to have a front focus problem.
Although Canon never admitted it from series 7 the complaints suddenly stopped.
So check the serial, if it starts with a 6 or something below you might be in the danger zone, from 7 and up you should be ok.

Best thing is a quick test of course.

1. take a ruler or download the tool which I put on my website
http://www.honders.net/tmp/scale45.jpg

2. put camera on a tripod with the aperture wide open

3. put ruler or tool in a 45 degree angle in front of the camera

4. select center AF point and focus half way on the ruler or tool

5. take shot

6 examine the result at 100%

A good camera should show about as much sharpness in front as aft of your fixed focus point, in bad examples you will see blur in front and much more sharpness beyond the fixed focus point.

Good luck
The truth lives in one’s mind, it doesn’t really exist
 
aviopic
Posts: 2423
Joined: Sat Mar 13, 2004 7:52 pm

RE: Canon 10D Autofocus

Tue Aug 23, 2005 6:45 am

Quoting IL76 (Reply 1):
My 10D autofocus sometimes acts up losing focus exactly when the shutter is fired. Quite frustrating. Also I noticed it started to hunt more often.

E cleaning the contacts on the body and the lens with some alcohol(it's a waste I know) usually does the trick.

W

Edit: the easiest way is to use a ear stick thingy(???) and dip it in the alcohol.

[Edited 2005-08-22 23:47:36]
The truth lives in one’s mind, it doesn’t really exist
 
Dehowie
Posts: 1065
Joined: Wed Feb 18, 2004 8:41 am

RE: Canon 10D Autofocus

Tue Aug 23, 2005 9:58 am

The focus test on the 10D is not quite so easy as using a ruler.
As the centre mark uses both vertical and horizontal lines for focusing and it twice the size of the box itself an accurate test is difficult to do.
The camera can quite easily focus on an area at the edge of the centre box and still be working perfectly.
For the best guide check out the great article on Canon AF published in the Canon SLR forum at Fred Miranda's.
Lots of great tech information and an excellent focus test for the Canon SLR range.
Quite a bit more to it than you'd imagine and its a very inforamtive post.
DArren
2EOS1DX,EF14.2.8LII,17TS,85/1.2,16-35L,24-70LII,24L,70-200F2.8LII,100-400,300/400/500/800L
 
IL76
Posts: 2237
Joined: Mon Jan 05, 2004 5:43 am

RE: Canon 10D Autofocus

Tue Aug 23, 2005 2:54 pm

Quoting Aviopic (Reply 2):
So check the serial, if it starts with a 6 or something below you might be in the danger zone, from 7 and up you should be ok.

The first non-0 digit in my serial number is a 4... But I don't have sharpness issues, it's the hunting and losing the lock that sometimes give me problems. But I say 'sometimes', it's not a super big issue.  Smile

Cheers!
Eduard
 
Woody001
Posts: 508
Joined: Mon Feb 23, 2004 7:39 am

RE: Canon 10D Autofocus

Tue Aug 23, 2005 8:30 pm

If you want to try and see if your cameras AF is working ok try this link;
http://www.canon-dslr.com/Canon_Jan05/Canon_SLR_Focus_Test.htm

Ian.
If I could just get the afterburner working...
 
aviopic
Posts: 2423
Joined: Sat Mar 13, 2004 7:52 pm

RE: Canon 10D Autofocus

Wed Aug 24, 2005 4:19 am

Quoting Dehowie (Reply 4):
The focus test on the 10D is not quite so easy as using a ruler.

It was just meant as a quick check to establish whether you have a faulty cam or not of course it is not an all in all AF test.

Quoting Dehowie (Reply 4):
As the centre mark uses both vertical and horizontal lines for focusing

That is why I supplied a tool without the horizontal lines.

Quoting Dehowie (Reply 4):
The camera can quite easily focus on an area at the edge of the centre box and still be working perfectly.

That's indeed a possibility and I forgot to mention to mount a 70-200 or something similar with a narrow DOF.... so preferably F2.8
In any case it is not meant for a wide angle lens.

Quoting Dehowie (Reply 4):
Quite a bit more to it than you'd imagine and its a very inforamtive post.

It sure is and I have to admit it kept me busy for some time although I never experienced any problem myself.
My college did have a faulty cam though, he bought his 10D half a year before I did, and therefore I know this quick test is enough to establish the status of yours. It really looks funny.

Quoting IL76 (Reply 5):
But I don't have sharpness issues, it's the hunting and losing the lock that sometimes give me problems.

I did not say your problem was related to the front focus problem, it's not.
But it is bugging me too from time to time and given my background I started to examine the electronics and found the problem is related to the contacts between the cam and lens.
Now I am cleaning them ones every 3 months or so and the problem disappeared completely.
The truth lives in one’s mind, it doesn’t really exist
 
singel09
Posts: 135
Joined: Thu Jan 20, 2005 12:32 pm

RE: Canon 10D Autofocus

Thu Aug 25, 2005 8:29 pm

ok got it .. so far , absolute winner for me .. no issues with AF yet .. hope to post the first shot soon! Thanks for all the tips! It helped!

mause

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