is it faulty

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a200

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hi i just bought a camera and lens and the lens makes a grinding type of noise when it trys to focus does this sound as though it is faulty
 
depends on the noise exactly. Several make a slight whirring noise as the motors zoom in out..... and yes at times the AF can make a noise as it tries to work out what you're focusing on and adjucts accordingly.......

However without listening - who knows?
 
its a sony a200 with sigma dg 70-300mm lens
 
If its a whirring it might just be the motors. My IS lens make a slight noise.

But, if its Grinding, that sounds bad.

What kind is it, is it new?
 
Would be useful to know what lens it is. A friend of mine bought a Tamron zoom for his 30D and it sounds rough when it's focussing (compared to a Canon USM) works fine though.
 
Is it a new lens or an old one? I've got an old sigma that used to grind when using AF as the drive on the body didn't quite fit the drive on the lens so they used to just ride over each other. If they're both new I'd say you'd got a problem and need to take them back.
 
Sony's are quite well known for striping gears on certain Sigmas.

Pop 'sony sigma gear strip' in to Google
 
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