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Help XC 15-45 OIS + X-S20

Esmuz

By Esmuz
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Esmuz Newbie

Esmuz

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Hi, I just got my new X-S20.

One of the main reasons I got it, is IBIS, as my main field of use is filming. I come from an X-T20, I loved it but the lack of IBIS, amongst other things, limited me a lot as I mainly shot handheld.

I like to go light, so I like to bring the smallest lens possible, and that's why I expected to use the XC 15-45, which is small, light, has some OIS, and the lens quality is ok for filming. The unit I have is not part of the kit, I just got it second hand. 

I tried the camera stabilization using IBIS + OIS setting + Mode Boost, with three lenses:

XC 15-45 3.5-5.6

FX 27mm 2.8 ( only IBIS )

XF 18-55mm 2.8-4

The kind of stabilization I am looking for and trying is with static shots, no camera move, almost like a picture. I am not looking for a gimball simulation. 

TESTS:

The Stabilization with the 15-55 is fantastic, very happy with the results ( testing at 55mm )

https://youtu.be/04Wa5qcM3rU

The stabilization with the 27mm is surprisingly good too, despite not being an OIS lens

https://youtu.be/gNrz8QTtcOs

But the stabilization with the 15-45 ( testing at 45mm in the video, but same behavior with the 15mm end and any other focal length )
is even worse than when I used it with my X-T20, https://www.youtube.com/watch?v=AM8Gisbr0SY, it's like the body is not using IBIS with it at all. It catches my heart beats and every micro shake.

https://youtu.be/nMEE2631uqA

The only way I can somehow make the IBIS react and be a bit more responsive is by shaking the lens a bit, and then it becomes a bit more stable as in this test, but not to the pair with other fixed lenses I tried, it actually might be just an illusion and there's no significant improvement.  
https://youtu.be/GlO7VaUPXQU

---------------

How come that is possible? The camera is supposed to be sold with this lens, so I expect it to work perfectly as a combination.

Any idea what could be happening?

The lens is updated with the latest firmware 1.12, and the camera body too 3.11.

I also cleaned the lens contacts just in case. 

The most logical reason for this it that the lens OIS is not working properly for some reason but the camera can't tell, ( I have not another same lens to try ) if I would be getting similar results with non OIS lenses all would make sense, but that's not the case, it works great with them, much better, actually. 

Any idea is welcome, Thanks!

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