Helix rear camera very slow

I have the thinkpad helix for two months.  The front facing camera works fine, but rear facing camera is very slow: focus slow, and if move the camera a little, picture refreshes very very slow.
I thought this was the problem of driver, so I updated to the latest driver yesterday. However, the problem is still there.
This makes the camera useless.
Do you also have this problem? Is this a hardware or software problem? How to fix this? Thanks!
Solved!
Go to Solution.

excactly the same to me. rear camera (if I use the 4:3-5M: Camera-Option instead of 16:9 2,1 M-Camera) it's so slow, you can't work. 16:9 is slow enough.
I think very interesting: if you start the app "skitch" and use the camera -> it works very fast ...
with the "normal" camera app or onenote-app it works very very slow.
I don't understand the circumstanding ...
some weeks ago there was an update from micrsoft -> another driver was installed and the speed was pretty good, but there was an issue, you couldn't do a foto ...
I didn't find a newer driver for the camera - it's the driver form microsoft 2006 usb-verbundgerät - the newer driver from lenovo only replace the driver for the front camera but not for the rear camera - look at https://forums.lenovo.com/t5/X-Series-Tablet-ThinkPad-Laptops/helix-rear-camera-driverinstallation-f...
kind regards
Dieter

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