IS off while mounting lens?

I just read a review of a Sigma macro lens with OS at the digital picture dot com. The author stated that you should mount the lens with the OS turned off, and he always turns off IS when mounting a lens,
I always make sure the camera is off when mounting a lens, bit do you need to turn IS off? I have never done this and have never had a problem with my Canon IS lenses.
Am I tempting fate and doing it wrong?

I've never thought about it with my Canon and Nikon bodies with Canon, Nikon and Sigma IS/VR/OS lenses and never had a problem

Nikon Australia recommends turning VR off with camera body ON before shipping a lens.

2.Turn your VR off (where applicable) whilst the lens is still connected to a camera that is powered on, this will ensure the correct locking of the VR mechanism so that it does not move excessively whilst in transit.

I can't find any mention of doing that when mounting.

I heard the same thing about the Sigma 70-200 f/2.8 OS HSM. I never shut the IS off on that lens unless I was shooting daytime sports. I did wait a few seconds to make sure the IS had shut itself off... most of the time. Never had any problems with that lens until I got too old and it got too heavy.

I do not turn off the stabilization on my Canon IS or Sigma OS lenses, and remove as needed. Chances are as GeoKras1989 mentioned, there is a few seconds after using the lens before it gets changed - but I do not pay attention. Been doing this for years, as of the moment no issues.

If I'm shooting an event I'm in a rush and just swap without turning anything off. If I'm not rushed I usually turn-off the camera first but sometimes I forget.

I'll let you know if that ever causes a problem, but it hasn't so far.

I never turn anything off when swapping lenses

The book for the old 100-400 lens said to not change lenses if the IS was on & active. I don't know what it says about the newer lenses.

PhotosGuy wrote in post #17619815
The book for the old 100-400 lens said to not change lenses if the IS was on & active. I don't know what it says about the newer lenses.

Oops. I guess I'll keep that in mind for now on, as that one's in my bag most of the time.

I just looked at the manual for the 24-105L online and it states that if the shutter button has been pressed with IS on, IS will be active for up to 2 sec. The instructions say that you shouldn't remove the lens while IS is active. I would imagine that if the camera is turned off, IS will be deactivated.
What do you think?
I know that the indicator light flashes when you open the SD card slots on Canons, even with the power set to off.

artyH wrote in post #17620238
I just looked at the manual for the 24-105L online and it states that if the shutter button has been pressed with IS on, IS will be active for up to 2 sec. The instructions say that you shouldn't remove the lens while IS is active. I would imagine that if the camera is turned off, IS will be deactivated.
What do you think?
I know that the indicator light flashes when you open the SD card slots on Canons, even with the power set to off.

I have no idea. But I usually get another lens ready to go on right away as I remove the one on the camera, so I suspect that there's enough time elapsed if I turn the cam off & then reach for the other lens & take the caps off.

To error on the side of being safe, I will now try to remember to turn any stabilization off before mounting lens....Cant hurt..

Up to now, never paid much attention to it.

I usually have the camera off when swapping lenses.

Frodge wrote in post #17620424
I usually have the camera off when swapping lenses.

Me 2

I've never turned anything off, not the cam, not the IS (except on tripod or if there is a shooting reason). I don't power down to change lenses, cards, or the battery. Turning the camera "off" really doesn't turn it off, it's more like a "keylock and power off displays" config. The camera will go to sleep on it's own and when asleep, uses the same power as when it's physically powered "off".

Never had a problem with IS issues, except if you leave your finger on the shutter while pulling the lens (IS is engaged - it'll remain floaty and loose after removal, just gotta put it back on and wait for the IS to lock down). This is really common with the 100L IS Macro.