m-p strange f-stop behaviour

[overexposed]

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Hi everybody,

 

recently i got aware of a strange f-stop switching effect on my m-p.

when i am doing pano shooting, with fix settings, exposure, f-stop and iso,  sometimes later in lightroom i realize that the f-stop info is varying, although the ring wasnt touched. in the case of the 135mm, the fstop was set to F8, every few pictures it changed to 6,8.

 

did anybody else have made the same experience?

 

best regards

 

Mirko

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[overexposed]

oh my, thx alot