[Leica] Leica R9 feels wonderful, minor issue with 80-200 f4 zoom

[vick.ko at sympatico.ca (Vick Ko)]

I just got a "new to me " Leica R9.

Gotta tell you, the camera feels wonderful in my hands.  It fits really 
well.

And works just great - I've complained about shutter lag in R7's and 
other R cameras.  I also have an R6.2 and that is about the only R that 
I like.

But, I do have one niggling issue - on the R9, with the 70-200 f4 Vario 
Elmarit zoom, when I set the f stop to f/4, the R9 shows it as f4.8.  
All my other lenses are read correctly by the R9, so I figure it is a 
minor thing with the lens.

First - anyone else know of this issue (f4 reads as f4.8)?

Second - anyone know of an easy DIY fix?

Thanks
Vick