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Old Sep 30, 2007, 4:23 PM   #1
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This is my first proper camera and i'm having problems..

I bought the camera from Canon retailer on an auction site as a refurbed unit..
I also bought a Sigma 18-50 lens and a Sigma 70-300 lens..
The problem is with AF,when i go to take a photo the AF adjusts but it's still just out of focus and the picture is slightly blurred.If i set it to manual and focus myself i can get a perfect picture..

This is happening with both lenses,and i've tried another 18-50 lens..

I take it that this should not be happening and i believe the problems lies with the camera..Has anyone alse had simlilar problems?...

Alan............Thanks
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Old Sep 30, 2007, 4:27 PM   #2
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http://i20.tinypic.com/vzblol.jpg

This is with AF
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Old Sep 30, 2007, 4:29 PM   #3
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http://i24.tinypic.com/2qu81t0.jpg


This is with manual focus....

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Old Oct 2, 2007, 4:23 PM   #4
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Thanks for the QUICK replies.....:sad:
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Old Oct 2, 2007, 6:36 PM   #5
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Hi Guiness8971,

Sorry to hear about your AF problems. I have a 350D / Rebel XT camera and have not had the same problem with most of my lenses (Canon 28-135mm, Canon 100-300mm, Sigma 10-20mm, Canon 18-55mm)... BUT my camera does have more trouble "nailing" exact focus on my Canon 50mm f1.8 prime.

I had another 50mm f1.8 prime lens, which I bought with the camera and it didn't focus well about 90% of the time. I exchanged the lens and this one focusses better (maybe it produces totally accurate focus 2 or 3 out of every 10, the other times it is always a tad out of focus), but not nearly so good as the other lenses I have. I know with f1.8 there IS small depth of field to play with, but I now am convinced my camera's "autofocus" mechanism is not strong enough to "nail it" with this lens, OR it just doesn't like the 50mm f1.8 type lenses most of the time... which of course is sort of annoying. I'll be keeping the 50mm f1.8 .. maybe my next camera (when my 350D / XT dies) will be more cooperative!

But I don't have the really inaccurate focussing problem (always out of focus) that you have. Mine is milder... and only with one (type of) lens.

So if I were you, I would try an actual Canon lens (say try a friends, or one from a store, maybe a trusted local place you know).. and see if bad autofocus only happens on sigma lenses..?

You wrote you got it from a Canon retailer on an auction site as a refurbed unit. Did they mention anything about warranty? Could you post it back to them for a refund or for another "refurbishment" to correct this major problem.

Let us know the outcome.

Please be aware that this is a website with folks just like yourself looking for and giving advice, sometimes it DOES take time and patience to get answers!

Best wishes.

Paul
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Old Oct 2, 2007, 6:40 PM   #6
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oh yes, another PS...

by the way I have to say you seem to have a very patient (your dog!) subject to test your autofocus issues!!

And as you wrote this is your first "proper" camera... does that mean your first DSLR (or SLR)?

Are you 100% sure you have the autofocus switch (on your lenses) to AF (auto focus)? If you have them to MF (manual focus) this could be the problem... check your lenses. There seems to be only 9 seconds between your out of focus and in focus shots... I don't know, maybe you know about af / mf on your lenses .. just trying to help.

Paul
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Old Oct 3, 2007, 2:59 AM   #7
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Come on dude. Isolate your variables. It affects more than one lens. So it looks like your camera AF is not working properly.

If you put those same lenses on another body and they work fine that will totally eliminate the lens as a source of the problem.

On the other hand - those pictures are not great examples to demonstrate AF issues. Trying to get a camera to autofocus on a patch of black is not exactly clever is it?

Choose a better subject to demonstrate your problem - the camera manual tells you how the AF works and what sort of subjects it will and won't be able to autofocus accurately with. Find something with good contrast and texture at a reasonable distance from the camera - I don't know how close those lenses can focus but if that is with the 75-300 you might be pushing the minimum distance too.
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Old Oct 8, 2007, 3:14 PM   #8
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Quick update...I returned the camera to where i bought it from for a full refund and bought a new one from a shop which is perfect,only wish i had done this in the first place...Yes this is my first "proper" camera,the other i've had have just been point and shoot.....Thanks again...Alan..
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