[kayjay200]

I have the above lens and I am very happy with the results. The one thing I am not too sure about is the noise. Not digital noise but the noise the IS makes when it is on. Its a type of chattering and is far louder than the auto focus. Can any of you who have this lens confirm this is normal or should I look at returning it before it grinds to a halt. All the other lens I have with IS are Canon and very quite
Thanks

[Fowl Mouth]

Kayjay, it's normal for the Sigma. Apparently the Canon "IS" is a bit quieter. Not sure about the Nikon "VR". It took me by surprise the first time I used the 150-500, but I soon got used to it. FWIW I've stopped using OS while tripod mounted because it slows down the lock-on process by a half second, or so. It sure is a godsend when hand held near dusk or dawn, though.

[kayjay200]

Originally Posted by Fowl Mouth

Kayjay, it's normal for the Sigma. Apparently the Canon "IS" is a bit quieter. Not sure about the Nikon "VR". It took me by surprise the first time I used the 150-500, but I soon got used to it. FWIW I've stopped using OS while tripod mounted because it slows down the lock-on process by a half second, or so. It sure is a godsend when hand held near dusk or dawn, though.

Thanks for that, I thought it was normal, but just wanted some re assuarance. Yes I found out about the tripod stuff as well. Thanks again

[malc1]

For Fowl Mouth, the OS should never be used when the lens is on a tripod according to sigma. I don't know why but it applies to all lenses with anti shake gizmos.

[Fowl Mouth]

Originally Posted by malc1

For Fowl Mouth, the OS should never be used when the lens is on a tripod according to sigma. I don't know why but it applies to all lenses with anti shake gizmos.

Thanks Malc1. It is true that it isn't recommended to use OS (or IS, or VR, etc...) while tripod mounted. I will retort, though, that despite what Sigma says, it actually works fine on a tripod by reducing virtually any residual shake, making the recommendation a curiosity to me (and many others, from what I have read elsewhere). My point is that if you have a tripod and can use proper long lens technique, you don't need to use the OS, and can speed up auto focus lock on time. Your observation might be valid, though. I could be missing something?

[eastwood]

I think this is a bit strange too. I used my Canon 300 f2.8 IS (and my Sigma 150-500 OS) on tripod with IS on (mode 1) and can't see anything wrong with the image.
I won't bother it UNLESS with IS on when tripod mounted will cause damage to the IS mechanism. Perhaps the company should clarify it.