Sony 24-105mm f/4 G OSS. How do I know OSS is working?

[Zedster]

I bought a Sony 24-105 with OSS. My question is, how do I know it is working when fitted to Sony A6100?

When I switch on camera OSS in my A7C with non OSS lens, I can feel a slight vibration in the camera and the viewfinder appears steady. When I use a Nikon lens with OSS and depress the shutter button half way I get a very pronounced vibration, can hear a motor running and the viewfinder steadies itself.

I recently bought the lens above. When I use it on my A6100 with OSS on the lens switched on I don't feel or hear anything and there is no obvious change in the viewfinder. So how do I know if it is working? Is there supposed to be any feedback that OSS is doing something?

  

 

[Cameratose]

The vibration is the sensor. Since the A6100 does not have IBIS, you won't feel it. If you're seeing any stabilization improvement at all, it's the lens. 

Zoom the lens all the way to 105mm and take a shot at 1/200 shutter to use as a control. Now slow your shutter down a stop at a time, starting around 1/100, then 1/50, then 1/25, etc. and see where the image is no longer sharp. That will tell you how about how many stops of stabilization you're getting with the lens at 105mm. 

[Zedster]

Will give that a try, was thinking of doing something similar only trying a series of shots with it on and a series of shots with it off to compare. On my Nikons the VR in the lens is very noticable, was expecting something similar.

[Cameratose]

I use the 24-105 on an A7 IV and an A1, and never feel any vibration of any kind when turning the camera on.