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Author Topic: Canon EF-S 18-200MM IS slow to auto focus  (Read 1445 times)

magnum

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Canon EF-S 18-200MM IS slow to auto focus
« on: June 21, 2012, 09:13:37 AM »
I am finding my new EF-S 18-200mm IS lens quite slow to autofocus. Anyone else notice this or is it just me?
Canon EOS 7D, 600D (T3i) both with EF-S 18-200mm 1:3.5-5.6 IS. Canon EF-S 10-22mm 3.5-4.5 USM

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Canon EF-S 18-200MM IS slow to auto focus
« on: June 21, 2012, 09:13:37 AM »

neuroanatomist

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Re: Canon EF-S 18-200MM IS slow to auto focus
« Reply #1 on: June 21, 2012, 10:13:42 AM »
It's not a USM lens, but rather uses a micromotor - that means relatively slow AF.  Obviously, it's also camera- and subject dependent.
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katwil

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Re: Canon EF-S 18-200MM IS slow to auto focus
« Reply #2 on: June 21, 2012, 11:07:14 AM »
Yes, I’ve noticed that on mine.  The versatility of that lens at its price point comes with compromises.  It’s good for a lot of things, but great at none.

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Re: Canon EF-S 18-200MM IS slow to auto focus
« Reply #3 on: June 21, 2012, 12:05:48 PM »
I am finding my new EF-S 18-200mm IS lens quite slow to autofocus. Anyone else notice this or is it just me?
Quite slow is not a very descriptive term, does it tale 0.5 sec, 5 sec, or 5 minutes?  Are you focusing from mfd to infinity, or from 5 ft to10ft?  You could have a bad lens, or it could be normal.  We really can't tell, and assumptions are often wrong.
Comparing focus time with a lens like the 50mm f/1.4 will make the 50mm look fast, it does not move the internal mechanism nearly as much as iin the 18-200.

magnum

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Re: Canon EF-S 18-200MM IS slow to auto focus
« Reply #4 on: June 22, 2012, 01:26:03 AM »
I am finding my new EF-S 18-200mm IS lens quite slow to autofocus. Anyone else notice this or is it just me?
Quite slow is not a very descriptive term, does it tale 0.5 sec, 5 sec, or 5 minutes?  Are you focusing from mfd to infinity, or from 5 ft to10ft?  You could have a bad lens, or it could be normal.  We really can't tell, and assumptions are often wrong.
Comparing focus time with a lens like the 50mm f/1.4 will make the 50mm look fast, it does not move the internal mechanism nearly as much as iin the 18-200.

OK, I only had this lens a short time and no other experience with a 11X zoom. I bought Canon (over Tamron, et al) as I thought it would be superior (reviews certainly preferred it).

It was an internal evening shot last night on around 170mm photographing my wife (before and after shots) of a cosmetic treatment. Distance to subject was around 1 to 1.5 metres (didn't measure it exactly). To begin with it would not focus at all. So I exchanged it for the EF 75-300 mm kit lens, which instantly focused. OK obviously not a problem with the camera, then cleaned the contacts on the 18-200 lens and tried again. This time it did focus but took quite a while compared to the 75-300. How long I don't know for sure as I didn't time it.

Sorry for the lack of precision. 
Canon EOS 7D, 600D (T3i) both with EF-S 18-200mm 1:3.5-5.6 IS. Canon EF-S 10-22mm 3.5-4.5 USM

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Re: Canon EF-S 18-200MM IS slow to auto focus
« Reply #4 on: June 22, 2012, 01:26:03 AM »