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Old 7th of June 2009 (Sun)   #1
photobaby
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Default lens won't autofocus

My XS is about 2 months old and all of a sudden the autofocus on my 18-55mm lens won't work. The red light blinks when the shutter button is pressed halfway, but it won't take a picture. It will take a picture on MF. I tried my new 50-250 lens and it will take a picture using AF. So does this mean there is a problem specifically with the 18-55 lens, or could it be a problem with the camera? I tried doing a search for ideas and it was suggested to recharge the battery even if it looks like it's charged. So I'm doing that now. Any other ideas?
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Old 7th of June 2009 (Sun)   #2
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Default Re: lens won't autofocus

Well, the obvious is, is the switch on the lens in AF or MF? Is the camera in One Shot or AI Servo?
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Old 7th of June 2009 (Sun)   #3
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Default Re: lens won't autofocus

The lens was on AF. It will work on MF but not on AF. The camera is set to One Shot.
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Old 7th of June 2009 (Sun)   #4
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Default Re: lens won't autofocus

Charging the battery didn't help, and I can't get it to focus at all. The red light doesn't blink and the shutter button won't go further down than halfway. It must be a problem with the lens, which is strange because one minute it was working fine, and the next it didn't. I didn't drop it or anything.

So my next question is do I call B&H tomorrow since that is where I bought it? It would still be under warranty. Or should I call Canon?
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Old 7th of June 2009 (Sun)   #5
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Default Re: lens won't autofocus

Quote:
Originally Posted by photobaby View Post
So my next question is do I call B&H tomorrow since that is where I bought it? It would still be under warranty. Or should I call Canon?
After two months, there's no point calling B&H. Call Canon.
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Old 7th of June 2009 (Sun)   #6
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Default Re: lens won't autofocus

Look at the contacts on the back of the lens and make sure they are OK. May even clean them off good. If that doesn't work do as Mr Kirk said and call Canon.
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Old 8th of June 2009 (Mon)   #7
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Default Re: lens won't autofocus

Thanks, I did clean the contacts and it didn't help either.
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Old 8th of June 2009 (Mon)   #8
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Default Re: lens won't autofocus

Time to call Canon.
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Old 8th of June 2009 (Mon)   #9
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Default Re: lens won't autofocus

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The red light doesn't blink and the shutter button won't go further down than halfway.
That sounds like a button problem to me.
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Old 8th of June 2009 (Mon)   #10
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Default Re: lens won't autofocus

I called Canon and they had me try a couple of things that didn't work. He told me to go ahead and send it in since it is under warranty. After I hung up the phone I started thinking about the MF. The camera would take a pic in MF but it wasn't in focus. I haven't used MF yet, so I tried to turn the focus ring on the lens and after a tiny bit of resistance, it turned. And now the AF works! I think it must have gotten stuck somehow. Do you think this is a problem with the lens, or just something that happens sometime? I don't want to send it in and be without it if I don't have to. We have a vacation coming up soon and I'm really looking forward to using my camera. Since it's just 2 months old I'm leaning towards not sending it in unless it happens again, I still have plenty of time under warranty in case in happens again. Any advice?

Last edited by photobaby : 8th of June 2009 (Mon) at 19:53.
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Old 8th of June 2009 (Mon)   #11
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Default Re: lens won't autofocus

Do not mess with it further. Don't use it or turn it. What probably happened is, you got some sand in the part that turns. I did that once, and it ruined the lens when I forced it to turn. It's under warranty. Bite the bullet and send it in and make sure you add a complete written explanation as to what you just found and put it in the box where they will find it.
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Old 8th of June 2009 (Mon)   #12
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Default Re: lens won't autofocus

So even though it is working now you think I should send it in? Won't they just think I'm crazy since it's working?
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Old 8th of June 2009 (Mon)   #13
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Default Re: lens won't autofocus

No, they won't.

Tell them 'focus ring stiff, AF fails at times'

They'll take it apart and, if nothing is really wrong, they'll still clean it and calibrate it.

Of course, you could do nothing and be fine, too, but whatever caused that problem probably didn't go away because you turned the focus ring.
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Old 8th of June 2009 (Mon)   #14
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Default Re: lens won't autofocus

Ok, thanks that makes sense.
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Old 9th of June 2009 (Tue)   #15
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Default Re: lens won't autofocus

Sorry, site was down for me. No, I would not use it any more. Your supposed to write out what the problem was, so the guys in the shop know what to look for. If you describe what happened, they will take it apart and fix it. I think using it further will just make it worse, and harder to fix in the end.
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