A problem with 5D mark III firmware 1.3.3

Feb 5, 2015
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Hello,

I've noticed the following problem after update to latest firmware 1.3.3:

Lens is Zeiss ZE APO Sonnar 135mm f/2.0

In live view Av mode, aperture set to f/2.0, camera changes aperture (closes it by itself) when lighting conditions changed. Displayed value stays on f/2.0, but looking into lens you can see that aperture closes down. It happens dеspate exposure simulation is enabled or disabled.

In movie live view mode camera behaves as normal.

I would like to ask if anyone else has the same problem?