David A. Mann wrote:

> 
>  Yeah that was probably me.  You need to scrape the paint off where the
> extension tube lines up with the electrical contacts on the body, so they
> are all shorted together with the tube mounted.
> ...

Thanks David.
I did a little experimentation with aluminium foil and it seems to me that only the 
extra AF contact (wrt the classic KA ones) needs to be shorted to the lens, am I 
wrong? 

Maybe the "total scaping" alternative is actually tidier and more effective, though. 

Flavio
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