is it faulty

[a200]

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

[petersmart]

What camera and lens - but normally a grinding noise is not good news.

[Lynton]

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?

[a200]

its a sony a200 with sigma dg 70-300mm lens

[poppy6]

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?

[zeugma]

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.

[Kev M]

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.

[leaky5]

Sony's are quite well known for striping gears on certain Sigmas.

Pop 'sony sigma gear strip' in to Google

[stan the man]

yep,sounds like the gear stripping problem as richard mentions above.if it's recently bought,contact sigmaUK and they should ask you to send it to them for repair under warranty.:thumbs:

[poppy6]

yip a200 and sigma 70-300 = stripped gears

see here (http://www.dynaxdigital.com/index.php?topic=7795.0)