Lens making some noise

[flyin-lowe]

I recently acquired a 75-300 IS USM Canon lens. I got it out today just to take a test shot and noticed when I hold the shutter part way down I can hear a slight humming sound coming from the lens as if something is spinning. It only does this when the IS is turned on and it last about 3 seconds then it stops until I push the shutter button part way down again and it will go for another couple of seconds. The AF and everything appears to be working on the lens. I have a couple other IS lenses and can't hear anything from them. Is this normal or is there a problem?

 

[o hey tyler]

It's normal, it's the IS. Hence why it does it when IS is turned on. It's just the IS doing it's job.

 

[flyin-lowe]

I caught on to the fact that it was likely the IS since that is only when it worked. I just couldn't figure out if it supposed to do it and if so why my other IS lenses don't do the same.

 

[KmH]

It helps to know a little bit about how all this techno stuff actually works, so you know when something is broken, or not: Image stabilization - Wikipedia, the free encyclopedia

 

[Big Mike]

Some lenses have a louder IS sound that others....which is probably why this one sounded different from your other IS lenses.

This is completely normal and nothing to worry about.

 

[flyin-lowe]

Thanks

 

[KmH]

Shorter focal length lenses don't have to move the IS correction elements nearly as far or as fast, as IS in long focal length lenses.